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A kind of preparation method of vinyl chloride catalyst by oxychlorination of ethane

A technology for producing vinyl chloride by oxychlorination of ethane and a catalyst, which is applied in the field of preparation of catalysts for producing vinyl chloride by oxychlorination of ethane, can solve problems such as affecting the service life of the catalyst, reducing catalyst activity, and loss of Fe ions, so as to reduce energy consumption. Consumption, good catalytic activity, low cost effect

Inactive Publication Date: 2015-11-25
INNER MONGOLIA UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The catalyst consists of (Fe x 3+ m 2-x 3+ )O 3 (M is usually Al, 0<x<2), containing 1% to 15% (mass fraction) of iron ions. When iron ions account for 4%, the effect is the best, and the vinyl chloride yield is up to 41.4%, but the catalyst is deactivated faster
Then, Goodrich Company found in further research that the catalyst lost too fast Fe ions during the catalytic reaction, which was the main cause of catalyst deactivation.
After 100 hours of reaction, the loss of Fe ions is as high as 85%, which seriously affects the service life of the catalyst. Although the loss of the catalyst can be reduced by adding components such as La, the activity of the catalyst is greatly reduced.

Method used

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  • A kind of preparation method of vinyl chloride catalyst by oxychlorination of ethane

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Experimental program
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Effect test

Embodiment 1

[0015] Embodiment 1: 1.19g tin powder is dissolved in 50ml dilute cold nitric acid and is made into tin nitrate solution, takes by weighing 4.34g cerium nitrate hexahydrate, 0.5g potassium nitrate, 4.04g ferric nitrate nonahydrate, 12.5g citric acid monohydrate, Add 0.3g of polyethylene glycol 2000 and 5.2g of titanium dioxide into the tin nitrate solution, then add 30ml of deionized water, stir and evaporate the water in a water bath at 80°C, dry at 100°C for 14h, then bake at 500°C for 3h, and then bake at 700°C for 3h A catalyst for producing vinyl chloride by oxychlorination of ethane is obtained.

Embodiment 2

[0016] Embodiment 2: 0.59g tin powder is dissolved in 50ml dilute cold nitric acid and is made into tin nitrate solution, takes by weighing 2.17g cerium nitrate hexahydrate, 0.5g potassium nitrate, 2.02g ferric nitrate nonahydrate, 12.5g citric acid monohydrate, Add 0.3g of polyethylene glycol 2000 and 6.4g of titanium dioxide into the tin nitrate solution, then add 30ml of deionized water, stir and evaporate the water in a water bath at 80°C, dry at 100°C for 14h, then bake at 500°C for 3h, and then bake at 700°C for 3h A catalyst for producing vinyl chloride by oxychlorination of ethane is obtained.

Embodiment 3

[0017] Embodiment 3: 0.59g tin powder is dissolved in 50ml dilute cold nitric acid and is made into tin nitrate solution, takes by weighing 4.34g cerium nitrate hexahydrate, 0.5g potassium nitrate, 2.78g ferrous sulfate heptahydrate, 12.5g citric acid monohydrate , 0.3g of polyethylene glycol 2000 and 5.2g of titanium dioxide were added to the tin nitrate solution, and then 30ml of deionized water was added, stirred and evaporated in a water bath at 80°C, dried at 100°C for 14h, then calcined at 500°C for 3h, and then calcined at 700°C 3h to obtain a catalyst for the production of vinyl chloride by oxychlorination of ethane.

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Abstract

The technical problem to be solved by the invention is to provide a preparation method for a catalyst for preparing chloroethylene via ethane oxychlorination. The catalyst contains rare-earth elements, alkali metal elements, iron element, tin element and titanium dioxide, and is applied to a fixed bed reactor; the preparation method for the catalyst is simple in process, low in reaction temperature, and reduced in energy consumption; air is used as a raw material gas, so that the cost is low; and the prepared catalyst has good catalytic activity while being applied to a reaction for preparing chloroethylene via ethane oxychlorination, the conversion rate of ethane is 80-100%, and the selectivity of chloroethylene is 40-68%.

Description

technical field [0001] The invention relates to a preparation method of a catalyst for producing vinyl chloride by oxychlorination of ethane, in particular to a catalyst for producing vinyl chloride by oxychlorination of ethane with good ethane conversion rate and vinyl chloride selectivity. Background technique [0002] Ethane is the main component of oilfield gas, natural gas, and refinery tail gas. How to make rational use of ethane is a subject that the chemical and petrochemical industry at home and abroad pay attention to. Ethane oxychlorination method uses ethane in natural gas or petroleum gas as raw material to directly synthesize vinyl chloride in one step, and its raw material price and equipment investment are greatly reduced compared with the ethylene process. The current practice in our country is to burn ethane as fuel, which not only wastes resources but also causes great pollution to the environment. HCl, another main raw material of the ethane oxychlorinat...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/835C07C21/06C07C17/154
Inventor 胡瑞生宋丽峰李洋洋李森
Owner INNER MONGOLIA UNIVERSITY