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A kind of separation and purification method of urea

A purification method and urea technology, applied in chemical instruments and methods, preparation of organic compounds, petroleum industry, etc., can solve problems such as inability to guarantee the purity of urea, and achieve the effect of improving economic benefits

Inactive Publication Date: 2016-05-11
GUIZHOU YIHUA CHEM
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Problems solved by technology

[0002] In the prior art, most of the chemical companies have begun to study the co-production of liquefied natural gas and urea from coke oven gas and converter gas; Utilization does not have a good technical solution, and thus cannot guarantee the purity requirements of the directly produced urea

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  • A kind of separation and purification method of urea
  • A kind of separation and purification method of urea
  • A kind of separation and purification method of urea

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Embodiment Construction

[0031] In order to make the purpose, technical solution and advantages of the present invention more clear, the embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings. It should be noted that, in the case of no conflict, the embodiments in the present application and the features in the embodiments can be combined arbitrarily with each other.

[0032] The invention provides a method for separation and purification of urea, such as figure 1 As shown, the following steps may be included:

[0033] Step a: preprocessing operation;

[0034] Transport the coke oven gas raw material gas to the oil removal tower for tar removal operation. When the tar content is removed to 23mg / m 3 Below, send the coke oven gas to the first section of the coke oven gas compressor for pressurization operation;

[0035] The pressurized coke oven gas is pretreated, when the tar content is removed below 5.5ppm, and the naphthalene is removed...

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Abstract

The invention discloses a urea separation and purification method which comprises the following steps: a pretreatment operation is performed; coke oven gas feed gas is transported to an oil removal tower for tar removal operation, and when the content of the tar is removed to 23 mg / m<3> or less, the coke oven gas is sent into a first section of a coke oven gas compressor for pressurization operation; the pressurized coke oven gas is subjected to pretreatment operation, and when the content of the tar is removed to 5.5 ppm or less and the content of naphthalene is removed to 1 mg / m<3> or less, the coke oven gas is sent into a second section of the coke oven gas compressor for pressurization operation; the pretreated coke oven gas is transported to a boiler for combustion, or is unloaded after combustion by a torch. The method can be applied to the urea preparation technology field; and with application of the method, gas of mixed feed gas in the preparation process can be effectively controlled, so as to ensure purity requirements of the finally-produced urea.

Description

technical field [0001] The invention relates to a process for co-producing liquefied natural gas and urea, in particular to a method for separating and purifying urea. Background technique [0002] In the prior art, most of the chemical companies have begun to study the co-production of liquefied natural gas and urea from coke oven gas and converter gas; Utilization does not have a good technical scheme, and then cannot guarantee the purity requirement of the urea produced directly. Contents of the invention [0003] The technical problem solved by the present invention is to provide a method for separating and purifying urea, by effectively separating nitrogen, hydrogen, ammonia, carbon dioxide, and methane from coke oven gas and converter gas during the preparation process, and effectively controlling the above gases , so as to ensure the purity requirements of the final output urea. [0004] In order to solve the problems of the technologies described above, the inven...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C273/04C10L3/08C10L3/10
Inventor 陈盼江冯发光陈军
Owner GUIZHOU YIHUA CHEM
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