GB/T 38731-2020 English PDFUS$189.00 · In stock
Delivery: <= 3 days. True-PDF full-copy in English will be manually translated and delivered via email. GB/T 38731-2020: Surface active agents - Test methods of technical sodium secondary alkylsulphates Status: Valid
Basic dataStandard ID: GB/T 38731-2020 (GB/T38731-2020)Description (Translated English): Surface active agents - Test methods of technical sodium secondary alkylsulphates Sector / Industry: National Standard (Recommended) Classification of Chinese Standard: G72 Classification of International Standard: 71.100.40 Word Count Estimation: 10,111 Date of Issue: 2020-04-28 Date of Implementation: 2020-11-01 Quoted Standard: GB/T 3050; GB/T 6365; GB/T 6366; GB/T 6368; GB/T 6682; GB/T 7378; GB/T 11275-2007; QB/T 2739-2005 Adopted Standard: ISO 895-1977, MOD Issuing agency(ies): State Administration for Market Regulation, China National Standardization Administration Summary: This standard specifies the pH value, water content, free base or free acid, total alkalinity, petroleum ether extractables, sodium alkyl sulfate, sodium sulfate, sodium chloride content and other indicators of the secondary alkyl sulfate in the surfactant industry test method. This standard applies to liquid industrial secondary sodium alkyl sulfate, which does not contain any products unrelated to preparation. This standard does not apply to powder or paste products. GB/T 38731-2020: Surface active agents - Test methods of technical sodium secondary alkylsulphates---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order. Surface active agents - Test methods of technical sodium secondary alkylsulphates ICS 71.100.40 G72 National Standards of People's Republic of China Test method of secondary alkyl sodium sulfate for surfactant industry 2020-04-28 released 2020-11-01 implementation State Administration for Market Regulation Issued by the National Standardization Management Committee ForewordThis standard was drafted in accordance with the rules given in GB/T 1.1-2009. This standard uses the redrafting method to amend and adopt ISO 895.1977 "Analytical Method of Secondary Alkyl Sodium Sulfate in Surfactant Industry". Compared with ISO 895.1977, the structure of this standard is adjusted as follows. --- Chapter 1 corresponds to Chapter 1 and Chapter 2 of ISO 895.1977; --- Chapter 2 corresponds to Chapter 3 of ISO 895.1977; --- Added Chapter 3 "Terms and Definitions"; --- Deleted Chapter 4 and Chapter 5 of ISO 895.1977; --- Chapter 4 corresponds to 6.1 of ISO 895.1977; --- Chapter 5 corresponds to 6.2 of ISO 895.1977; --- Chapter 6 corresponds to 6.3 of ISO 895.1977; --- Chapter 7 corresponds to 6.4 of ISO 895.1977; --- Chapter 8 corresponds to 6.5 of ISO 895.1977, and the test content is adjusted to Appendix A; --- Chapter 9 corresponds to 6.6 of ISO 895.1977, and the test content is adjusted to Appendix B; --- Chapter 10 corresponds to 6.7 of ISO 895.1977; --- Chapter 11 corresponds to 6.8 of ISO 895.1977; --- Chapter 12 corresponds to Chapter 7 of ISO 895.1977; ---Appendix C corresponds to the appendix of ISO 895.1977. The technical differences between this standard and ISO 895.1977 and the reasons are as follows. ---Regarding normative reference documents, this standard has made adjustments with technical differences to adapt to my country's technical conditions and adjustments. The situation is collectively reflected in Chapter 2 "Normative Reference Documents", and the specific adjustments are as follows. ● Added reference to GB/T 11275-2007 (see Chapter 5), GB/T 3050 (see Chapter 11), QB/T 2739-2005 (See A.2.5, B.2.3, B.2.5) and GB/T 6682 (see B.2); ● Replace ISO 4314 with GB/T 6365 which is equivalent to adopting international standards (see Chapter 6); ● Replace ISO 4315 (see Chapter 7) with GB/T 7378 modified to adopt international standards; ● Replace ISO 4316 with GB/T 6368 which is equivalent to the international standard (see Chapter 4); ● Replace ISO 6844 with GB/T 6366 which is modified to adopt international standards (see Chapter 10); ● The normative reference documents ISO 607, ISO 894 and ISO 4318 have been deleted. ---In order to facilitate the use of standards, Chapter 3 "Terms and Definitions" has been added. ---Because it was not used during the test, the sampling requirements in Chapter 4 of ISO 895.1977 were deleted. ---The content of Chapter 5 Principles of ISO 895.1977 has been deleted due to duplicate content. --- In order to adapt to the use of our country, the determination of water content has been modified (see Chapter 5). --- In order to adapt to the use of our country, the method of determination of sodium chloride content has been modified (see Chapter 11). ---In order to adapt to my country's usage habits and reagent specifications, the ethanol concentration has been modified (see A.2.2 and B.2.2). --- In order to adapt to my country's usage habits and reagent specifications, the boiling range of petroleum ether has been modified (see A.2.3). ---According to our country's operating habits, the type of flask has been modified (see A.3.1). ---According to our country's operating habits, the fractionating column has been deleted (see A.3). ---In order to adapt to the actual situation of our country, the reference documents of general laboratory utensils have been deleted (see A.3). --- In order to meet the test requirements, detailed sample dissolution, transfer and other operations (see A.4.2.1). --- In order to adapt to our country's operating habits, the amount and frequency of washing solvents have been adjusted (see A.4.2.5). ---In order to adapt to the actual situation of our country, simplify the description of the process of driving the solvent and constant weight, and delete the drawing requirements (see A.4.2.6 and A.4.2.7). ---In order to adapt to the actual situation in our country, sodium hydroxide was added to the reagent (see B.2.4). --- In order to adapt to the actual situation of our country, a flat-bottomed flask was added to the instrument (see B.3.1). --- In order to adapt to the usage habits of our country, the note has been modified (see B.5.1). This standard also made the following editorial changes. ---Modified the standard name; ---Integrate Chapter 1 of ISO 895.1977 with Chapter 2 of Chapter 1 of the cost standard; ---In the determination of petroleum ether extractables, the introduction is changed to note (see A.1); --- Deleted the description of 6.6.4.2 steam extraction during the evaporation of filtrate in ISO 895.1977; ---Modified the statement of the whole part (see B.4.1); --- Modified the description of the end point of the evaporated solvent (see B.4.2.5). This standard was proposed by the China National Light Industry Council. This standard is under the jurisdiction of the National Standardization Technical Committee for Surfactants and Detergents (SAC/TC272). Drafting organizations of this standard. China Daily Chemical Research Institute Co., Ltd. [National Detergent Products Quality Supervision and Inspection Center (Taiyuan)], Guangzhou Blue Moon Industry Co., Ltd., Shenzhen Bagemei Biotechnology Co., Ltd., Productivity Promotion Center for Surfactant and Detergent Industry. The main drafters of this standard. Li Xiaorui, Zhang Jingfeng, Guo Hongtao, Yao Chenzhi, Sun Yongqiang, Li Xiaohui. Test method of secondary alkyl sodium sulfate for surfactant industry1 ScopeThis standard specifies the pH value, water content, free alkali or free acid, total alkalinity, petroleum ether Test methods for the content of extracts, sodium alkyl sulfate, sodium sulfate, and sodium chloride. This standard applies to liquid industrial secondary alkyl sodium sulfate, which does not contain any products unrelated to the preparation. This standard does not apply to powder or paste products.2 Normative referencesThe following documents are indispensable for the application of this document. For dated reference documents, only the dated version applies to this article Pieces. For undated references, the latest version (including all amendments) applies to this document. GB/T 3050 General method for determination of chloride content in inorganic chemical products Potentiometric titration (GB/T 3050-2000, neq ISO 6227.1982) GB/T 6365 Surfactant free alkalinity or free acidity determination titration method (GB/T 6365-2006, ISO 4314. 1977, IDT) GB/T 6366 Surfactant inorganic sulfate content determination titration method (GB/T 6366-2012, ISO 6844.1983, MOD) GB/T 6368 Potentiometric method for determination of pH value of aqueous surfactant solution (GB/T 6368-2008, ISO 4316.1977, IDT) GB/T 6682 Analytical laboratory water specifications and test methods (GB/T 6682-2008, ISO 3696.1987, MOD) GB/T 7378 Surfactant alkalinity determination titration method (GB/T 7378-2012, ISO 4315.1977, MOD) GB/T 11275-2007 Determination of Water Content of Surfactants (ISO 4317.1991, IDT) QB/T 2739-2005 Preparation of test solutions for titration analysis (volume analysis) commonly used test methods for detergents3 Terms and definitionsThe following terms and definitions apply to this document. 3.1 Laboratory samples Samples prepared in order to be sent to the laboratory for inspection or testing. 3.2 Test sample Manufactured from laboratory samples, from which test parts can be directly weighed. 3.3 Free base or free acid The alkalinity or acidity measured with phenolphthalein as an indicator. Note. Depending on the situation, it can be expressed as "base value" or "acid value", that is, the number of milligrams of potassium hydroxide present in 1g of product, or the potassium hydroxide required to neutralize 1g of product Milligrams. 3.4 Alkalinity The surfactant solution is weakly alkaline due to various decomposition reactions. It neutralizes the hydrochloric acid consumed by a certain amount of product and uses the quality of sodium oxide. The quantity fraction indicates the degree of alkalinity of the product.4 Determination of pHAccording to the method specified in GB/T 6368, the determination is made with a 10% (mass fraction) solution of laboratory samples. Note. If the analyzed pH value is lower than 7.0, the sample and the batch sample it represents will be unstable, so most of the test results will change over time. In this case, pass Often discard the batch of samples without further analysis.5 Determination of water contentAccording to the method specified in 7.2 of GB/T 11275-2007, the azeotropic distillation method is used for determination.6 Determination of free base or free acidDetermined according to the method specified in GB/T 6365.7 Determination of total alkalinityWhen the pH of the sample is measured according to the method in Chapter 4, the measured result is much greater than 7, and the alkalinity is measured by the method in Chapter 6, the alkalinity value is far greater In this case, it is recommended to determine the total alkalinity according to the method specified in GB/T 7378.8 Determination of petroleum ether extractablesPetroleum ether extractables include sulfur-free products and products that do not dissociate in aqueous solution although they contain sulfur. Determined according to Appendix A.9 Determination of sodium alkyl sulfate contentDetermined in accordance with Appendix B. 10 Determination of sodium sulfate content Determined according to the method specified in GB/T 6366. 11 Determination of sodium chloride content Determined according to the method specified in GB/T 3050. 12 Test report The test result report should include the following. a) All the information needed to fully identify the sample; b) The measurement method used (No. of this standard); c) Results and presentation methods used; d) Test conditions; e) Any operation details not specified or optional in this standard, and any circumstances that will affect the results.Appendix A(Normative appendix) Determination of extractables of petroleum ether A.1 Principle Extract the petroleum ether extractables in the test alcohol solution with petroleum ether, distill off the petroleum ether, dry and weigh. Volatility of the product Be considered. Note. Petroleum ether extractables include unsulfonated (sulfurized) and non-sulfonated (sulfuric acid) compounds and products that contain sulfur but do not dissociate in water. A.2 Reagents Unless otherwise stated, only use reagents confirmed to be analytically pure and tertiary water in accordance with GB/T 6682 in the analysis. A.2.1 Anhydrous sodium sulfate. A.2.2 95% ethanol solution. A.2.3 Petroleum ether, boiling range 30℃~60℃. The evaporation residue should not exceed 0.002% (mass fraction). A.2.4 Sodium hydroxide, about 0.1mol/L solution. A.2.5 Phenolphthalein, 1g/L ethanol solution, prepared according to 5.1 of QB/T 2739-2005. A.3 Instruments A.3.1 Flat-bottomed flask, 250mL, with a ground glass stopper. A.3.2 Glass condenser, length 300mm. A.3.3 Separation funnel, 500mL. A.3.4 Volumetric flask, 500mL. A.3.5 Erlenmeyer flask, 250mL. A.4 Test procedure A.4.1 Test parts Weigh about 4g (accurate to 0.01g) laboratory sample and place it in a 100mL beaker. A.4.2 Determination A.4.2.1 Dissolve the test portion (A.4.1) with 50mL water, and transfer the solution to a 500mL separatory funnel A (A.3.3). Wash with water Beaker, wash water into the separatory funnel, the final volume is about 125mL, add 50mL ethanol solution (A.2.2). A.4.2.2 Check whether the solution is weakly alkaline with phenolphthalein (A.2.5), adjust it to alkaline with sodium hydroxide solution (A.2.4) as needed, shake well, and cool. However, add 50mL petroleum ether (A.2.3), shake for 30s, let it stand for stratification, if necessary, add a small amount of ethanol solution (A.2.2) to break the emulsion. A.4.2.3 Put the lower alcohol water phase into the second separatory funnel B (A.3.3), add 50mL petroleum ether for extraction. Collect the lower layer and transfer it to the Among the three separatory funnels C (A.3.3), the upper layer is transferred to the first separatory funnel A (A.3.3). So use 3 separatory funnels to alternately extract a total of 3 times, 50mL petroleum ether each time. Combine the petroleum ether phase in the separatory funnel A (A.3.3), and transfer the alcohol aqueous solution after the last extraction. Transfer to a 400mL beaker, and wash the separatory funnel B and C 3 times with 20mL of water or ethanol solution (5%~10%), and add the washing water to The aqueous alcohol phase in the beaker. A.4.2.4 Wash the ether phase with 15mL of water each time until the lotion is not alkaline. Incorporate the lotion into the aqueous alcohol phase, and the aqueous alcohol phase in boiling water Heat on the bath for 10min~15min to evaporate the petroleum ether and cool. Use phenolphthalein (A.2.5) to check if the solution is weakly alkaline, use hydrogen as needed Sodium oxide solution (A.2.4) is adjusted to alkaline. Transfer the solution to a 500mL volumetric flask (A.3.4), wash the beaker with water, and transfer the washing water to the volumetric flask, dilute and dilute to the mark. Solution L1, used to determine the content of sodium alkyl sulfate. A.4.2.5 Put the petroleum ether extract in a dry Erlenmeyer flask (A.3.5), add 10g of anhydrous sodium sulfate (A.2.1), shake and let stand still 30min. Filter with filter paper into a flat-bottomed flask (A.3.1) with a small amount of glass balls that has a constant weight, and use 50mL petroleum ether to divide 3 to 5 times Wash the Erlenmeyer flask, sodium sulfate, funnel and filter paper, and merge the washing liquid into a flat-bottomed flask. A.4.2.6 Connect the condenser (A.3.2) to the flask, heat it in an electric hot plate or a water bath to evaporate petroleum ether, and remove the condensation after the solvent is basically evaporated. Cool the flask to about 30°C, slowly pass in a stream of cold dry air to remove traces of solvent, turn the flask by hand to make the flask leave the electric heating plate Or water bath, in an inclined position. In this way, the liquid in the flask expands into a film to facilitate the removal of the last trace of solvent. In order to avoid volatilization loss, pay attention to driving away the solvent, especially when blowing the air stream. When some solvent odor can be detected, the burning The bottle was cooled to room temperature. Dry carefully and weigh. A.4.2.7 Reheat the flask to about 30°C, blow air flow, wipe dry, cool, and weigh. Repeat the operation until two consecutive weighings The difference is not more than 1mg. A.5 Results presentation A.5.1 Calculation method Petroleum ether extractables content X1, expressed in mass fraction, calculated according to formula (A.1). B.1 Principle Evaporate the alcohol aqueous solution (L1) obtained in Appendix A in A.4.2 to 1/10 of the original volume, add ethanol, evaporate to dryness, and add ethanol to evaporate To dry, add ethanol to evaporate to dryness (the purpose of repeating this operation is to remove the water in the alcohol aqueous solution). Extract the dry residue with hot ethanol Of sodium alkyl sulfate. By evaporating the solvent, the sodium alkyl sulfate is precipitated. The residue may contain some sodium chloride and sodium carbonate. Deducted from the total residue. Note. When measuring, it is important that the solution is always alkaline. B.2 Reagents Unless otherwise stated, only use reagents confirmed to be analytically pure and tertiary water in accordance with GB/T 6682 in the analysis. B.2.1 Acetone, the evaporation residue should not be greater than 0.005g/100mL. B.2.2 95% ethanol solution, using phenolphthalein as an indicator to adjust to slightly alkaline with 0.1mol/L sodium hydroxide solution. B.2.3 Sulfuric acid, 0.1mol/L standard solution, prepared according to 4.4 of QB/T 2739-2005. B.2.4 Sodium hydroxide, about 0.1mol/L solution. B.2.5 Phenolphthalein, 1g/L ethanol solution, prepared according to 5.1 of QB/T 2739-2005. B.3 Apparatus B.3.1 Flat bottom flask, 250mL. B.3.2 Pipette, 100mL. B.3.3 Oven, the temperature can be controlled at 85℃~90℃. B.3.4 Vacuum dryer. B.4 Test procedure B.4.1 Test parts Use a 100mL pipette (B.3.2) to draw the remaining alcoholic solution (L1) after the determination of petroleum ether extractables (A.4.2) (see also Appendix C), into a 250mL beaker. B.4.2 Determination B.4.2.1 Reduce the volume of the test portion (B.4.1) to about 10mL by evaporating on the water bath and passing air flow. B.4.2.2 Add 20mL ethanol solution (B.2.2) and evaporate to dryness, then add 20mL ethanol solution and evaporate to dryness. Then add 50mL B Alcohol solution, use a glass stirring rod to disperse the residue, and place it on a water bath to boil for 3 minutes while stirring. B.4.2.3 Set aside to settle the ethanol-insoluble matter, tilt the upper layer of hot liquid, and filter it through filter paper to a weighed 250mL with a little glass beads. Bottle (B.3.1). Place the flask on a boiling water bath and evaporate the filtrate. B.4.2.4 Add 25mL ethanol solution to the beaker, make it boil, and boil slightly for 2min. Then let stand, pass the upper liquid through the same filter paper Filter into the flask. Repeat the extraction twice or more, each time with 25mL of hot ethanol solution, add ethanol solution for the last time, and transfer most of the insoluble matter to the filter. On paper. Wash the beaker, filter paper and the contents on the filter paper with hot ethanol solution, pay special attention to the edge of the filter paper, there should be no traces of grease. B.4.2.5 Slowly pass in air to remove the last trace of solvent. Add 10mL of acetone (B.2.1), continue to evaporate to dryness, during this operation, Continue to inject air and turn the flask by hand to make the flask leave the water bath in an inclined position. In this way, the liquid in the flask expands into a film to facilitate Remove the last traces of solvent. Place the flask in an oven (B.3.3) for 5 minutes, and control the oven temperature at 85°C to 90°C. Take it out and put it in a vacuum dryer (B.3.4) Cool and weigh. Repeat the above drying, cooling and weighing operations to a constant weight, that is, within a 15min interval, the difference between the two successive weighing values is not more than 0.005g. B.4.2.6 Dissolve the residue in water, if necessary, warm it to dissolve completely. Use phenolphthalein (B.2.5) to check whether the solution is weakly alkaline. Adjust to alkaline with sodium hydroxide solution (B.2.4) as needed. Determine the sodium carbonate content brought in during the extraction process (if total alkalinity and free alkali If there is no difference in the degree of determination result, there is no need to determine the sodium carbonate content). The determination method is based on phenolphthalein solution (B. The solution (B.2.3) is titrated. T......Tips & Frequently Asked Questions:Question 1: How long will the true-PDF of GB/T 38731-2020_English be delivered?Answer: Upon your order, we will start to translate GB/T 38731-2020_English as soon as possible, and keep you informed of the progress. The lead time is typically 1 ~ 3 working days. 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