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GB/T 13255.2-2009: Test methods of caprolactam for industrial use -- Part 2: Determination of crystallizing point
Status: Valid GB/T 13255.2: Evolution and historical versions
| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivered in | Standard Title (Description) | Status | PDF |
| GB/T 13255.2-2009 | English | 189 |
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Test methods of caprolactam for industrial use -- Part 2: Determination of crystallizing point
| Valid |
GB/T 13255.2-2009
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| GB/T 13255.2-1991 | English | 199 |
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Caprolactam for industrial use--Determination of crystallizing point
| Obsolete |
GB/T 13255.2-1991
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Basic data | Standard ID | GB/T 13255.2-2009 (GB/T13255.2-2009) | | Description (Translated English) | Test methods of caprolactam for industrial use -- Part 2: Determination of crystallizing point | | Sector / Industry | National Standard (Recommended) | | Classification of Chinese Standard | G15 | | Classification of International Standard | 71.080 | | Word Count Estimation | 8,856 | | Date of Issue | 2009-05-13 | | Date of Implementation | 2010-01-01 | | Older Standard (superseded by this standard) | GB/T 13255.2-1991 | | Quoted Standard | GB/T 13255; GB/T 8170 | | Regulation (derived from) | PRC National Standard Approval Announcement 2009 No.6 (Total No.146) | | Issuing agency(ies) | General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China, Standardization Administration of the People's Republic of China | | Summary | This standard specifies the determination of caprolactam industrial crystallization point. | GB/T 13255.2-2009: Test methods of caprolactam for industrial use -- Part 2: Determination of crystallizing point
---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.
Test methods of caprolactam for industrial use Part 2. Determination of crystallizing point
ICS 71.080
G15
National Standards of People's Republic of China
Replacing GB/T 13255.2-1991
Test methods of caprolactam for industrial use
Determination of crystallizing point. Part 2
Posted 2009-05-13
2010-01-01 implementation
Administration of Quality Supervision, Inspection and Quarantine of People's Republic of China
Standardization Administration of China released
Foreword
GB/T 13255 "Industrial caprolactam test method" is divided into eight sections.
--- Part 1. Determination of a 50% aqueous solution of chromaticity spectrophotometry;
--- Part 2. Determination of crystallizing point;
--- Part 3. Determination of permanganate absorption spectrophotometry value;
--- Part 4. After distillation of volatile alkali content of titration;
--- Part 5. 290nm wavelength measured absorbance;
--- Part 6. Determination of acidity or alkalinity;
--- Part 7. Determination of iron content;
--- Part 8. Determination of cyclohexanone oxime content.
This section GB/T 13255 Part 2.
This Part replaces GB/T 13255.2-1991 "Determination of caprolactam industrial crystallization point."
This section compared with the GB/T 13255.2-1991, the main changes are as follows.
Chapter 7);
--- Added "Report" (see Chapter 8).
This part is proposed by the China Petroleum and Chemical Industry Association.
This part of the National Standardization Technical Committee on Organic Chemistry Club (SAC/TC63/SC2) centralized.
This section drafted by. China Petroleum & Chemical Corporation Baling Branch.
The main drafters of this section. Zhao Jun red, Shenpei Zhi, Kuang Zhigang.
This part of the standard replaces the previous editions as. GB/T 13255.2-1991.
Test methods of caprolactam for industrial use
Determination of crystallizing point. Part 2
1 Scope
GB/T 13255 provisions of this part of the industrial process measurement caprolactam crystallization point.
2 Normative references
The following documents contain provisions which, through reference GB/T 13255 in this section constitute provisions of this section. For dated reference documents
Member, all subsequent amendments (not including errata content) or revisions do not apply to this section, however, encouraged to reach under this section
Parties to research agreement to use the latest versions of these documents. For undated reference documents, the latest versions apply to this
section.
GB/T 8170 repair numerical representation about rules and limit values \u200b\u200band judgment
3 Method summary
The molten sample was observed during cooling of the temperature change, crystallization occurs when the maximum temperature observed and maintained for some time
Constant, the temperature of crystallization point.
4 Instrument
4.1 Crystallization tube. diameter 25mm, wall thickness (1 ~ 2) mm, length 150mm.
4.2 outer protective tube. diameter 28mm, wall thickness (1 ~ 2) mm, length 120mm.
4.3 agitator. stainless steel wire system, the diameter of 1mm, more than 160mm long and has a diameter of about 20mm and at right angles to the axis of the ring.
4.4 Main thermometers. mercury thermometer glass rod, range (62 ~ 76) ℃, dividing the value of 0.1 ℃, long 300mm, full immersion and after
Correction.
4.5 Auxiliary thermometer. glass rod mercury thermometer, range (0 ~ 50) ℃, dividing the value of 1 ℃.
4.6 vacuum bottle (see Figure 2). a glass, an inner diameter of 35mm, outside diameter 55mm, length 120mm, vacuum jacket.
4.7 glycerin bath. 1000mL beaker or other similar device can control the temperature (77 ~ 80) ℃.
4.8 asbestos rubber covers or other similar materials.
Installation 5 Instrument
5.1 Main thermometer position. fixed with a rubber plug in the middle of crystallization mouth of the tube, the mercury at the bottom of the ball away from its crystalline bottom of the tube about 15mm.
5.2 Auxiliary thermometer Location. attached to the main thermometer, so that the mercury ball is located between the stopper at one point and the crystallization temperature at a point two minutes.
5.3 stirrer Location. drilling a hole in the stopper, the stirrer insert crystallization test tube, located between the main wall thermometer with the crystalline sample, three
You can not collide.
5.4 outer protective tube position. fixed on the rubber cover asbestos holes, placed vertically glycerin bath.
5.5 Crystallization tube Location. means the outer protection tube.
Step 6 Analysis
When measured using a crystallization tube, a thermometer, a stirrer should be clean and dry.
The laboratory sample mix, filled with crystalline tube, stopper tightly, and then placed in a bath of glycerol outer protective tube, in a temperature controlled bath glycerine
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