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GB/T 37359-2019 PDF English

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GB/T 37359-2019: Test method of activity for palladium carbon catalysts
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GB/T 37359-2019: Test method of activity for palladium carbon catalysts

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NATIONAL STANDARD OF THE PEOPLE’S REPUBLIC OF CHINA ICS 71.100.99 G 74 Test method of activity for palladium carbon catalysts ISSUED ON: MARCH 25, 2019 IMPLEMENTED ON: FEBRUARY 01, 2020 Issued by: State Administration for Market Regulation; Standardization Administration of the People’s Republic of China.

Table of Contents

Foreword ... 3 1 Scope ... 4 2 Normative references ... 4 3 Principle ... 4 4 Reagents or materials ... 4 5 Test device ... 5 6 Sample ... 6 7 Test procedures ... 7 8 Test data processing ... 8 Test method of activity for palladium carbon catalysts

1 Scope

This Standard specifies the test method of activity for palladium carbon catalysts. This Standard applies to palladium carbon catalysts of hydrogenation reduction reactions for petrochemical industry, pharmaceutical intermediates, electronics industry, perfume industry, dye industry and other fine chemicals, which takes wood powdered activated carbon as the carrier and palladium as the main active component.

2 Normative references

The following documents are indispensable for the application of this document. For dated references, only the dated version applies to this document. For undated references, the latest edition (including all amendments) applies to this document. GB/T 6679, General rules for sampling solid chemical products GB/T 6682, Water for analytical laboratory use. Specification and test methods

3 Principle

The N-benzylaniline in the raw material, under certain temperature and pressure and the action of a palladium carbon catalysts, reacts with hydrogen to generate aniline and toluene. The chemical reaction formula is as follows: Use a gas chromatograph to determine the mass fraction of N-benzylaniline before and after the reaction; calculate the conversion rate of N-benzylaniline, to characterize the activity of the catalyst.

4 Reagents or materials

4.1 N-Benzylaniline: purity greater than 99.0%. Weigh 0.010 0 g of the catalyst sample corresponding to palladium; accurate to 0.000 1 g; put aside for use.

7 Test procedures

Warning -- The test materials and reagents which are involved in this Standard have toxic, flammable, and explosive hazards to human health and safety. System leakage shall be strictly prevented; open flames are strictly forbidden on the site; preventive facilities such as necessary fire extinguishing equipment and exhaust equipment shall be equipped; it is strictly forbidden to carry out disassembly operation of autoclave under pressure. This Standard does not reveal all possible safety issues; users shall use it strictly in accordance with relevant regulations, and have the responsibility to take appropriate safety and health measures. 7.1 Filling of the reactor Add 30.0 g of N-benzylaniline, 150 mL of ethanol, 1.0 mL of formic acid, and catalyst samples (see 6.3) to the clean and dry reactor in order; cover the kettle lid; tighten the nuts evenly; then, connect it to the system. 7.2 Leakage test Open the nitrogen valve; introduce nitrogen into the system; boost the system to 0.50 MPa; close the inlet and outlet valves of the system. If the pressure drop is less than 0.05 MPa within 30 min, the system is considered to be sealed. Open the system outlet valve to reduce the pressure of the system to normal pressure; insert the temperature measuring thermocouple into the thermowell. 7.3 Gas replacement and activity determination Use nitrogen to replace the system for 3 times; then, exhaust and reduce the pressure to normal pressure. Switch to hydrogen and replace for 3 times; then, exhaust and reduce the pressure to normal pressure. Warm and heat the reactor. When the temperature of the reactor is raised to 50°C, increase the system pressure to 0.50 MPa. Control and maintain the reactor pressure at 0.50 MPa, the temperature at 50°C, and the stirring speed at 900 r/min. After 20 minutes, end the test. 7.4 Power-off Turn off the hydrogen and turn on the cooling water; after the temperature of the reactor drops to below 40°C, release the pressure. Use nitrogen to replace the system for 3 times; perform sampling and analysis; use deionized water to clean the reactor body. ......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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