Method for separating by-products in coal-to-ethylene glycol coupling esterification process
A technology of ethylene glycol coupling esterification and process, which is applied in the field of separation of by-products of coal-to-ethylene glycol coupling esterification process, and can solve problems such as environmental pollution, long process, and large investment in equipment
Pending Publication Date: 2021-09-10
SHANDONG HUALU HENGSHENG CHEM IND
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Problems solved by technology
In this way, on the one hand, a large amount of raw material methanol and high value-added dimethyl carbonate will be lost, and on the other hand, the vented methyl formate and methylal will cause great pollution to the environment
Another method is to delighten and separate methyl formate and methylal from a part of the esterified liquid phase, and then enter the pressurized rectification by side extraction, and refine at normal pressure to obtain carbon ester products. Although this method avoids the first method above waste and pollution problems, but because the carbon ester content of the raw material liquid for separating carbon esters is relatively low, the process is longer and the investment in equipment is large
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[0020] It should be understood that the specific embodiments described here are only used to explain the present application, and are not intended to limit the present application.
[0021] In the following description, the use of suffixes such as 'module', 'part' or 'unit' for denoting elements is only for facilitating the description of the present application and has no specific meaning by itself. Therefore, 'module', 'part' or 'unit' may be used in combination.
[0022] figure 1 A schematic structural diagram of an embodiment of the system for separating the by-products of the coal-to-ethylene glycol coupling esterification process provided in the examples of this application, as shown in figure 1 As shown, the system includes: light component removal tower 1 and carbon ester product tower 2. Optionally, the light-removing component tower 1 is a packed tower or a tray tower, and the carbon ester product tower 2 is a packed tower or a tray tower, which is not limited in t...
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The invention relates to a method for separating by-products in a coal-to-ethylene glycol coupling esterification process, which comprises the following steps of: extracting a product from the top of an esterified methanol rectification tower I in the coal-to-ethylene glycol coupling esterification process, feeding the product into a light component removal tower, extracting a product from the top of the esterified methanol rectification tower I by the light component removal tower, and separating methyl formate and methylal; and extracting a product from the top of a coupled glufop-butyl refining tower in the coal-to-ethylene glycol coupling esterification process, feeding the product into a carbon ester product tower, extracting a product from the top of the coupled glufop-butyl refining tower by the carbon ester product tower, and separating dimethyl carbonate. The method provided by the invention is relatively low in cost, and realizes efficient separation of by-products in the coal-to-ethylene glycol coupling esterification process.
Description
technical field [0001] The present application relates to the technical field of coal-to-ethylene glycol, in particular to a method for separating by-products of coal-to-ethylene glycol coupling esterification process. Background technique [0002] In the production process of coal-to-ethylene glycol, the coupling esterification process will produce by-products such as dimethyl carbonate, methyl formate and methylal. If they are not separated and taken out in time, the liquid phase environment of the coupling esterification reaction will be deteriorated. , affecting the stable operation of the system. [0003] At present, one way of coal-to-ethylene glycol coupling esterification by-products is to directly discharge a part of the esterification liquid phase, sell it as cheap monohydric alcohol, and empty methyl formate and methylal. In this way, on the one hand, a large amount of raw material methanol and high value-added dimethyl carbonate will be lost, and on the other ha...
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IPC IPC(8): C07C69/96C07C68/08C07C67/54C07C69/06C07C41/58C07C43/30
CPCC07C68/08C07C67/54C07C41/58C07C69/96C07C69/06C07C43/30
Inventor 常怀春于富红孙一倩崔海涛许海宁张玉奇刘浩
Owner SHANDONG HUALU HENGSHENG CHEM IND