Cooling method for rectification vacuum pump in ketene dimer production

A technology of diketene essence and diketene, applied in pump components, variable capacity pump parts, liquid variable capacity machinery, etc., can solve problems such as large water consumption, waste of materials, environmental impact, etc., to save energy, reduce emissions, reduce Effects of Environmental Pollution

Inactive Publication Date: 2017-01-25
ANHUI JINGHE IND
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0003] The purpose of the present invention is to solve the problem that the rectification vacuum pump in the prior art consumes a large amount of water during operation, and the water also contains a certain amount of diketene, which no...

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  • Cooling method for rectification vacuum pump in ketene dimer production

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Embodiment Construction

[0013] The rectification vacuum pump cooling method in diketene production comprises the following steps:

[0014] 1. After the crude diketene is produced, it is sent to the diketene rectification system and heated by a membrane evaporator. The rectification system is connected with a vacuum pump to maintain a certain negative pressure in the rectification system. Under negative pressure, the crude diketene becomes diketene vapor , through the packed tower for separation, decolorization, and further purification, and finally the gaseous diketene enters the condenser to condense into the finished product of diketene.

[0015] Put 25# transformer oil in the oil tank with cooling tubes, keep the liquid level above 200CM, 25# transformer oil overflows into the oil cooler, when the rectification vacuum pump is running, put 25# transformer oil from the oil cooler The medium is pumped into the pump body to play the role of cooling and sealing, and the oil circulation is maintained at...

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Abstract

The invention relates to a cooling method for rectification vacuum pump in ketene dimer production, wherein the method comprises the steps of: placing 25#transformer oil in an oil groove with cooling pipe, when the rectification vacuum pump is operating, pumping the 25#transformer from the oil cooler to the pump for cooling and sealing, combining the ketene dimer taken back from the bottom connected by the rectification vacuum pump to coarse ketene dimer section. The outlet gas of the rectification vacuum pump is pumped in tail gas absorber to spray and absorb ketene dimer. When acid content of circulating recycling liquid reaches 35-50%, the liquid is sent to glacial acetic acid for recycling, and residual carbon dioxide and nitrogen are pumped in the cracking still as fuel. The cooling method of rectification vacuum pump in ketene dimer production utilizes oil to replace water as cooling and sealing of vacuum pump, and uses soft water to absorb gases such as ketene dimer in the vacuum pump, which not only saves a great deal of water reduces emission, but also takes back ketene dimer to save resources and reduce environmental pollution.

Description

technical field [0001] The invention belongs to the technical field of chemical industry, and relates to a rectification vacuum pump cooling method and a venting air recovery method in the production of diketene. Background technique [0002] The raw material glacial acetic acid is crude diketene produced in the cracking furnace section. After the crude diketene is sent to the rectification system for rectification, the content of the crude diketene reaches more than 97.5%, which can be regarded as a qualified diketene product. The function of the vacuum pump connected to the rectification system is to maintain a certain negative pressure in the rectification system. When the rectification vacuum pump is running, it is cooled and sealed with water. It consumes a lot of water in the normal production process, and the water also contains a certain amount of diketene. It not only wastes materials, but also needs to carry out sewage treatment, and at the same time has an impact ...

Claims

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Application Information

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IPC IPC(8): C07D305/12F04B39/06
CPCC07D305/12F04B39/06
Inventor 夏家信徐成刚
Owner ANHUI JINGHE IND
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