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Mercury-free catalyst for synthesizing vinyl chloride by acetylene method and preparation method thereof

A technology of mercury catalyst and vinyl chloride, which is applied in the field of mercury-free catalysts and preparations for the synthesis of vinyl chloride by the acetylene method, which can solve the problems of low activity that cannot meet industrial needs, difficulty in realizing industrial production, and high preparation prices, and achieves the purpose of increasing the effective load area , improve catalytic activity, low preparation difficulty

Inactive Publication Date: 2017-07-25
WUHAN INSTITUTE OF TECHNOLOGY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, there are many researches and developments on mercury-free catalysts for the synthesis of vinyl chloride by the acetylene method. The noble metal mercury-free catalysts have high activity, but the preparation price is high, and it is difficult to realize industrial production; the cost of the base metal mercury-free catalysts is relatively low, and the stability is slightly better. Low activity can not meet the needs of industry; the present invention combines the advantages of noble metal mercury-free catalysts and base metal mercury-free catalysts to propose a mercury-free catalyst with high activity and low preparation cost and its preparation method

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0015] Soak the coconut shell activated carbon with 4mol / L acetic acid solution for 12 hours, then wash the activated carbon to neutrality with deionized water to obtain the pretreated carrier; 0.1g ruthenium trichloride, 1g cuprous chloride and 2.4g of bismuth chloride were dissolved in 2mol / L hydrochloric acid, and then the solution was vacuum-impregnated into 30g of pretreated coconut shell activated carbon, and rotated in a water bath at 70°C for 8 hours, and then dried at 120°C to obtain The required catalyst was named Cat-1. Using catalyst Cat-1 to catalyze the hydrochlorination of acetylene to synthesize vinyl chloride, the molar ratio of hydrogen chloride to acetylene is 1.15:1, the reaction temperature is 160°C, and the space velocity is 50h -1 , the acetylene conversion rate is 99.4%, and the ethylene selectivity is 99.6%.

Embodiment 2

[0017] Soak the coconut shell activated carbon with 3mol / L acetic acid solution for 12 hours, then wash the activated carbon to neutrality with deionized water to obtain the pretreated carrier; mix 0.3g ruthenium trichloride, 3g cuprous chloride and 7g of bismuth chloride were dissolved in 2mol / L hydrochloric acid, and then the solution was vacuum-impregnated into 30g of pretreated coconut shell activated carbon, and rotated in a water bath at 70°C for 8 hours, and then dried at 120°C to obtain the obtained required catalyst, which was named Cat-2. Catalyst Cat-2 is used to catalyze the hydrochlorination of acetylene to synthesize vinyl chloride, the molar ratio of hydrogen chloride to acetylene is 1.15:1, the reaction temperature is 160°C, and the space velocity is 50h -1 , the acetylene conversion rate is 99.5%, and the ethylene selectivity is 99.6%.

Embodiment 3

[0019] 4mol / L acetic acid solution soaked coconut shell activated carbon for 12 hours, then activated carbon was washed to neutrality with deionized water, and the carrier after pretreatment was obtained; 0.1g ruthenium trichloride, 3g cuprous chloride and 5g of bismuth chloride was dissolved in 2mol / L hydrochloric acid, then the solution was vacuum-impregnated into 30g of pretreated coconut shell activated carbon, and rotated in a water bath at 70°C for 8 hours, and then dried at 120°C to obtain the desired catalyst, which is named Cat-3. Catalyst Cat-2 is used to catalyze the hydrochlorination of acetylene to synthesize vinyl chloride, the molar ratio of hydrogen chloride to acetylene is 1.15:1, the reaction temperature is 160°C, and the space velocity is 50h -1 , the acetylene conversion rate is 99.2%, and the ethylene selectivity is 99.7%.

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Abstract

The invention relates to a mercury-free catalyst for synthesizing vinyl chloride by an acetylene method and a preparation method. The preparation method comprises the following steps of using an acetic acid solution to soak coconut husk activated carbon for 8 to 24h, and using deionized water to wash the activated carbon to neutral state, so as to obtain a pretreated carrier; then, while stirring at normal temperature, dissolving ruthenium trichloride, cuprous chloride and bismuth chloride into a hydrochloric acid solution, impregnating the solution into the pretreated coconut husk activated carbon under the vacuum atmosphere, performing rotary evaporation, and drying, so as to obtain the required catalyst. The preparation method has the beneficial effects that the mercury-free catalyst has high activity and selectivity when the acetylene is catalyzed to synthesize the vinyl chloride; the mercury-free catalyst uses the mercury-free active component, the green and environment-friendly effects are realized, the multiple sets of auxiliary equipment are not needed, the difficulty in preparation is low, the production technology is simple, and the preparation method is suitable for industrialized production.

Description

technical field [0001] The invention relates to a catalyst preparation technology, in particular to a mercury-free catalyst for synthesizing vinyl chloride by acetylene method and a preparation method. Background technique [0002] Polyvinyl chloride is one of the plastic products with the largest output in the world. The demand for vinyl chloride monomer of polyvinyl chloride will increase. my country's energy structure of "more coal, less gas and less oil" determines that in the next few decades The main production method of vinyl chloride will still be the acetylene method. At present, the loss of mercury in the mercury catalyst used in the synthesis of vinyl chloride by the acetylene method in my country is very serious. On the one hand, it leads to a sharp decline in domestic mercury reserves and resource shortages. On the other hand, the lost mercury seriously pollutes the environment and endangers human health. It is imperative to develop a mercury-free catalyst for t...

Claims

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Application Information

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IPC IPC(8): B01J27/13C07C17/08C07C21/06
CPCB01J27/13C07C17/08C07C21/06
Inventor 吴广文熊奇廖先传凌思胡争朋
Owner WUHAN INSTITUTE OF TECHNOLOGY
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