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Mercury-free catalyst with high catalytic activity for synthesizing vinyl chloride and preparation method thereof

A catalytic activity, mercury catalyst technology, applied in the direction of hydrogen halide addition preparation, chemical instruments and methods, catalytic reactions, etc., can solve the problems of low catalytic activity, low vinyl chloride yield, short service life, etc., and achieve high catalytic activity Effect

Active Publication Date: 2016-12-14
NINGXIA JINHAI CHUANGKE CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] (1) Low catalytic activity;
[0006] (2) Used in the synthesis reaction of vinyl chloride, the crude product of vinyl chloride obtained has low purity, low yield of vinyl chloride, and low selectivity of vinyl chloride;
[0007] (3) The catalyst is easily deactivated and has a short service life

Method used

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  • Mercury-free catalyst with high catalytic activity for synthesizing vinyl chloride and preparation method thereof
  • Mercury-free catalyst with high catalytic activity for synthesizing vinyl chloride and preparation method thereof
  • Mercury-free catalyst with high catalytic activity for synthesizing vinyl chloride and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Embodiment 1 A kind of preparation method of mercury-free catalyst for the synthesis of vinyl chloride with high catalytic activity

[0039] Include the following steps:

[0040] (1) Selection of carrier

[0041] Using activated carbon as a carrier, the activated carbon has an iodine value of 1223mg / g, a methylene blue value of 114mg / g, an adsorption value of carbon tetrachloride of 124%, a moisture content of 2%, ash content of 1.6%, a mechanical strength of 97.9%, and a bulk density of 398g / L , The specific surface area is 1421m 2 / g, the average pore size is 4.2-4.5nm, and the average particle size of the carrier is 55μm.

[0042] (2) Handling of the carrier

[0043] Prepare 500 kg of hydrochloric acid solution with a mass fraction of 2.2% with high-purity hydrochloric acid and desalinated water, place it at room temperature, and set aside;

[0044] Put 100 kg of selected activated carbon into the above hydrochloric acid solution and soak for 100 minutes. During ...

Embodiment 2

[0072] Example 2 Application of a mercury-free catalyst with high catalytic activity in the synthesis reaction of vinyl chloride

[0073] Include the following steps:

[0074] (1) Loading catalyst catalyst

[0075] Before loading the catalyst catalyst, check that there are no leaks inside and outside the reactor, and the inner wall of the tubes is clean, dry, and free of debris; the catalyst of the present invention is immediately packed into each tube of the reactor after opening the package, and the catalyst should be loaded within 0.5h Finish inside, beware of moisture.

[0076] (2) Preheating

[0077] Inject dry HCl at 90-100°C, and control the rate at 7m 3 / h, continuously for 12 hours, during which acid is released from the bottom of the reactor every 2 hours.

[0078] (3) Synthesis of vinyl chloride reaction

[0079] The molar ratio of acetylene and hydrogen chloride is controlled at 1:0.92 (100% purity), and the mixed gas with a preheated temperature above 90°C is...

Embodiment 3

[0085] The screening of copper compound in the catalyst component of embodiment 3

[0086] Adopt the preparation method of mercury-free catalyst described in Example 1, only change the type of copper compound in the selection of catalyst raw materials in step (3), and change the solvent for dissolving the corresponding copper compound in step (5) at the same time to ensure the corresponding copper compound Dissolve fully, carry out single factor analysis experiment, will prepare mercury-free catalyst, adopt the application method described in embodiment 2 to carry out experiment, experimental result is shown in Table 1.

[0087] The screening of copper compound in the catalyst component of table 1

[0088]

[0089] Through the above-mentioned single factor analysis experiment, it can be seen that Embodiment 1 is a preferred embodiment, that is, the copper compound in the catalyst component is preferably chlorinated ketone.

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Abstract

The invention provides a mercury-free catalyst with high catalytic activity for synthesizing vinyl chloride. The mercury-free catalyst is prepared from the raw materials of platinum, stannic chloride, cuprous chloride, methyltrioxorhenium, (1,5-cyclooctadiene)palladium dichloride(II), dibutyltin dilaurate and a carrier. The invention further provides a preparation method of the mercury-free catalyst. The mercury-free catalyst prepared by the method has high catalytic activity, and every gram of the mercury-free catalyst can be applied to catalysis to produce 1,80 to 1.85kg of vinyl chloride; in the prior art, every gram of low-mercury catalyst can be applied to catalysis to produce 1.25kg of vinyl chloride; the mercury-free catalyst prepared by the method is applied to a vinyl chloride synthetic reaction; as proved by chromatographic analysis, the purity of the vinyl chloride in an obtained crude product is 97.0 to 97.3 percent by volume, the yield of the vinyl chloride is 98.0 to 98.2 percent, and the selectivity of the vinyl chloride is 99.98 to 100 percent.

Description

technical field [0001] The invention relates to a mercury-free catalyst for synthesizing vinyl chloride with high catalytic activity and a preparation method thereof, belonging to the technical field of catalysts. Background technique [0002] At present, there are two major types of vinyl chloride synthesis technologies in the world, namely ethylene oxychlorination and acetylene hydrochlorination. The acetylene synthesis of vinyl chloride still uses mercuric chloride catalysts with activated carbon as the carrier. However, the comparison of mercury resources in my country Deficient, and the mercury catalyst is easy to sublimate and lose to form pollution. Catalysts used in industry include high-mercury catalysts and low-mercury catalysts. The content of mercury chloride in high-mercury catalysts is 10-12%, and the content of mercury chloride in low-mercury catalysts is 4-6.5%. Both high-mercury catalysts and low-mercury catalysts contain mercury and are now being phased out...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J31/30C07C17/08C07C21/06
CPCB01J31/30B01J2231/32B01J2531/824C07C17/08C07C21/06
Inventor 李玉强
Owner NINGXIA JINHAI CHUANGKE CHEM TECH
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