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Long-service-life mercury-free catalyst for synthesizing vinyl chloride and preparing method thereof

A technology of mercury catalyst and vinyl chloride, which is applied in the direction of hydrogen halide addition preparation, chemical instruments and methods, organic compound/hydride/coordination complex catalyst, etc., can solve the problem of low catalytic activity of catalyst, short service life of catalyst, catalyst Carbon deposition and other problems, to achieve the effect of high catalytic activity and long service life

Active Publication Date: 2017-01-04
NINGXIA JINHAI CHUANGKE CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] (1) Used in the synthesis reaction of vinyl chloride, the crude product of vinyl chloride obtained has low purity of vinyl chloride, low yield of vinyl chloride, and low selectivity to vinyl chloride;
[0006] (2) The service life of the catalyst is short, and the catalyst is prone to carbon deposition, which leads to the deactivation of the catalyst;
[0007] (3) The catalytic activity of the catalyst is low

Method used

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  • Long-service-life mercury-free catalyst for synthesizing vinyl chloride and preparing method thereof
  • Long-service-life mercury-free catalyst for synthesizing vinyl chloride and preparing method thereof
  • Long-service-life mercury-free catalyst for synthesizing vinyl chloride and preparing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Embodiment 1 A kind of preparation method of mercury-free catalyst for the synthesis of vinyl chloride with long service life

[0037] Include the following steps:

[0038] (1) Selection of carrier

[0039] Using activated carbon as a carrier, the activated carbon has an iodine value of 1256mg / g, a methylene blue value of 117mg / g, an adsorption value of carbon tetrachloride of 130%, a moisture content of 2%, ash content of 1.3%, a mechanical strength of 97.7%, and a bulk density of 387g / L , The specific surface area is 1573m 2 / g, the average pore size is 3.3-3.4nm, and the average particle size of the carrier is 50μm.

[0040] (2) Handling of the carrier

[0041] Prepare 500 kg of hydrochloric acid solution with a mass fraction of 2.4% with high-purity hydrochloric acid and desalinated water, place it at room temperature, and set aside;

[0042] Put 100 kg of selected activated carbon into the above hydrochloric acid solution and soak for 80 minutes. During this pe...

Embodiment 2

[0060] Example 2 Application of a mercury-free catalyst with long service life in the synthesis reaction of vinyl chloride

[0061] Include the following steps:

[0062] (1) Loading catalyst catalyst

[0063] 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.

[0064] (2) Preheating

[0065] Pass in dry HCl at 90-100°C, control the rate at 5m 3 / h, continuous 15h, during which the acid is released from the bottom of the reactor every 2h.

[0066] (3) Synthesis of vinyl chloride reaction

[0067] The molar ratio of acetylene and hydrogen chloride is controlled at 1:0.87 (100% purity), and the mixed gas with a preheated temperature above 90°C is passed into the reac...

Embodiment 3

[0073] The screening of copper compound in the catalyst component of embodiment 3

[0074] 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.

[0075] The screening of copper compound in the catalyst component of table 1

[0076]

[0077] 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 long-service-life mercury-free catalyst for synthesizing vinyl chloride. The mercury-free catalyst is prepared from 0.4%-0.6% of platinum, 3.2%-3.5% of stannic chloride, 1.5%-1.9% of cuprous chloride, 1.1%-1.5% of methyltrioxorhenium, 0.9%-1.2% of tetrakis(triphenylphosphine)palladium, 0.8%-1.0% of trischlororhodium and the balance carrier. The mercury-free catalyst is used for a vinyl chloride synthetic reaction, and in the obtained coarse vinyl chloride product, the purity of the vinyl chloride is 96.5 v% to 96.8 v%, the yield of the vinyl chloride is 97.5% to 97.9%, and the selectivity of the vinyl chloride is 99.98% to 100%.

Description

technical field [0001] The invention relates to a mercury-free catalyst for synthesizing vinyl chloride with long service life 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
CPCB01J31/30B01J2231/32C07C17/08C07C21/06
Inventor 常炳恩
Owner NINGXIA JINHAI CHUANGKE CHEM TECH
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