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Novel method for synthetizing vinyl acetate by calcium carbide acetylene method

A vinyl acetate, calcium carbide acetylene technology, applied in chemical instruments and methods, preparation of organic compounds, preparation of carboxylic acid esters, etc., can solve the problems of vinyl acetate, etc., to reduce the generation of by-products, reduce costs, and save land occupation area effect

Inactive Publication Date: 2010-12-29
国能英力特能源化工集团股份有限公司
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  • Summary
  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

So far, there is no technology to produce vinyl acetate with fixed bed calcium carbide acetylene process

Method used

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  • Novel method for synthetizing vinyl acetate by calcium carbide acetylene method
  • Novel method for synthetizing vinyl acetate by calcium carbide acetylene method
  • Novel method for synthetizing vinyl acetate by calcium carbide acetylene method

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Embodiment Construction

[0035] After the fresh acetylene produced by calcium carbide is boosted with the blower booster 1, it is added to the lower part of the gas-liquid mixed evaporator 2, and at the same time, the acetic acid preheated in the first preheater 3 is added to the gas-liquid mixed evaporator 2 In the upper part, acetylene and acetic acid are mixed according to the volume ratio of 5-8:1. When the excess acetylene is saturated with preheated acetic acid, it enters the second preheater 4 and the third preheater 5 in sequence, and is heated to a temperature close to the reaction temperature with the high-temperature heat transfer oil introduced between the tubes of the preheater, that is, close to 443-488K. It is sent to the upper part of the tubular fixed-bed reactor 6.

[0036] The tubes of the tube-and-tube fixed-bed reactor are filled with catalyst zinc acetate 8. In order to make the gas distribution uniform, a gas distributor is installed at the entrance of the reactor, and an inert ...

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Abstract

The invention relates to a novel method for synthetizing vinyl acetate by a calcium carbide acetylene method, which is characterized in that synthetic reaction is carried out on acetylene gas produced by adopting calcium carbide and acetic acid in a tube array type fixed bed reactor. The novel method is realized by utilizing a fixed bed technology in a process for synthetizing the vinyl acetate by the calcium carbide acetylene method, and especially, acetic acid simultaneously enters a gas-liquid mixed evaporator under the action of the acetylene gas after being preheated by changing an acetic acid feed mode into a gas-liquid mixed feed mode, and then enters the reactor through a second preheater and a third preheater, and the gas mixture passes through an inert heat transfer filler and then passes though a corresponding catalyst to be synthetized into the vinyl acetate. By adopting the mode, the novel method can reduce reaction byproducts and has the advantages of easy separation, raw material use ration improvement, production cost reduction, conversion rate improvement, small investment, high product purity, high quality and low impurity content.

Description

[0001] technical field [0002] The invention belongs to the technical field of chemical engineering, in particular to a new method for synthesizing vinyl acetate by calcium carbide acetylene method. Background technique [0003] At present, there are two ways of synthesizing vinyl acetate with acetylene as raw material: fixed bed and ebullating bed (fluidized bed). Among them, the technology of producing vinyl acetate by fixed bed process was introduced from France by Premier Zhou Enlai in 1973. Years of practice have shown that the process of producing vinyl acetate in a fixed bed is better than that of a fluidized bed in all aspects, especially the vinyl acetate produced by a fixed bed has high purity, good quality and low impurity content, which is helpful For the development of high value-added products, the following is a comparison of some specific data: [0004] 1. Comparison of the quality indicators of the reaction solution produced by the fixed bed and ebullated ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C69/15C07C67/04
CPCC07C67/04Y02P20/582C07C69/15
Inventor 韵明生刘远大关永举
Owner 国能英力特能源化工集团股份有限公司
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