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Method for revamping a high pressure melamine plant

A technology for melamine and equipment, applied in the field of purification section of high-pressure melamine equipment, can solve problems such as unfavorable cost and high steam consumption of a stripper, and achieve the effect of eliminating steam consumption

Active Publication Date: 2018-09-28
CASALE SA
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this means high steam consumption in the stripper, which is very disadvantageous in terms of costs

Method used

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  • Method for revamping a high pressure melamine plant
  • Method for revamping a high pressure melamine plant
  • Method for revamping a high pressure melamine plant

Examples

Experimental program
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Effect test

Embodiment Construction

[0062] see figure 1 , The melamine plant 1 includes a high pressure section 100 and a purification section 200, the purification section 200 operates at significantly lower pressure and temperature.

[0063] The high-pressure section 100 is fed with a urea melt 5 to produce melamine 6 . When the melamine 6 leaves the high pressure section 100 , the pressure drops from above 7 MPa to 0.4-2 MPa and the melamine is supplied to the purification section 200 .

[0064] The purification section 200 mainly includes a quencher 2 , a stripper 3 and an absorber 4 . In the quencher 2, the melamine 6 is treated with an aqueous solution of ammonia 13c, 13b at about 160° C. to dissolve the melamine. The melamine collected from the bottom of the quencher 2 is fed to the stripper 3 as an aqueous solution 7 further diluted with a water stream 8 from the plant.

[0065] The stripper 3 is also fed with steam 9 and also with another water stream 19 from the plant, preferably from the plant. In...

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Abstract

A high pressure melamine plant comprising a synthesis section and a melamine purification section, wherein the synthesis section provides a first melamine-containing stream (6), and said melamine purification section comprises: a quencher (2) receiving said first melamine-containing stream (6) from the synthesis section; a stripper (3) fed with a second melamine-containing stream (7) from said quencher (2), wherein purified melamine (11) is collected and vapours (10) are extracted; a heat exchanger (12), wherein said vapours (10) are condensed providing a condensed stream (14); an absorber (4)fed with said condensed stream (14) providing an aqueous solution (15) comprising ammonia and carbon dioxide, at least a portion (15b) of said aqueous solution being exported from the purification section (200) of the plant.

Description

technical field [0001] The invention relates to the field of producing melamine from urea, in particular to a purification section of high-pressure melamine equipment, a related process and a transformation method thereof. Background technique [0002] The methods for synthesizing melamine from urea include low-pressure catalytic method and high-pressure non-catalytic method, usually higher than 7MPa. These methods are well known in the art. [0003] Conventional type plants for the synthesis of melamine using high pressure non-catalytic processes comprise a high pressure section essentially confined to a reactor, known as a melamine reactor, in which the urea melt feed is converted into crude melamine by adding heat. [0004] The conversion of urea to melamine also produces a gas consisting mainly of ammonia and carbon dioxide (the so-called "off gas") and various by-products (mainly OAT and polycondensates). The reaction products (melamine and off-gas), by-products and u...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07D251/60C07C273/12
CPCC07C273/12C07D251/60B01J2219/00006B01J2219/00024C07D251/62B60Q5/008B60Y2306/11F01N1/065G10K11/178G10K2210/12822H04R29/001H04R2499/13
Inventor 加布里尔·迪卡洛安德里亚·斯考托西蒙尼·甘巴
Owner CASALE SA
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