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Thickening process of coarse adipic acid

A kind of adipic acid and process technology, which is applied in the separation/purification of carboxylic acid compounds, filtration separation, fixed filter element filter, etc., which can solve the problems of limited production capacity of the device, poor production continuity of the thickening system, and high equipment failure rate. , to achieve the effects of short filtration cycle, improved equipment production capacity, and long service life of equipment

Active Publication Date: 2014-04-16
CHINA TIANCHEN ENG +1
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  • Abstract
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AI Technical Summary

Problems solved by technology

[0006] The problem to be solved by the invention is to overcome the problems of high failure rate of equipment leaked out of the old-fashioned dynamic rotary thickener, poor production continuity of the thickening system, and limited capacity of the device, and provide a thickening process for crude adipic acid

Method used

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  • Thickening process of coarse adipic acid
  • Thickening process of coarse adipic acid

Examples

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Embodiment 1

[0033] A thickening process for crude adipic acid, in which a static cluster thickener is used, the thickener is composed of a thickener shell side 7 and a thickener tube side 8, and a candle wick filter element is used to increase Several filter elements 9 are arranged on the filter tube of the tube side of the thickener. The whole operation process adopts sequential automatic control program.

[0034] At the beginning of a filtration cycle, the control system first runs a self-inspection program to check whether the liquid levels in the crude adipic acid slurry tank 1 and the crude adipic acid thickener 3 are normal. If the liquid level is normal, enter the filtration program .

[0035] The filtering process is as follows:

[0036] (1) Feeding: Open the feed valve at the outlet of the feed pump 2 of the crude acid thickener to pump the crude adipic acid slurry into the crude adipic acid thickener 3, and the opening time is 180 seconds. The regulating valve controls the fl...

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Abstract

The invention provides a thickening process of coarse adipic acid. In the thickening process, a static bundling-type thickener is used. The thickener consists of a thickener shell side and a thickener tube side; a candlewick-type filter element is used; and a filter tube of the thickener tube side is provided with a plurality of filter elements. The time sequence automatic control procedure is adopted in the whole operation process, comprises the steps of feeding, online cleaning of filter cloth, re-feeding, pre-filtering, filtering, draining feed liquid, exhausting air and removing filter cakes, wherein the whole filtering process lasts for 12-20 minutes, preferably 14 minutes. The thickening process of coarse adipic acid solves the problems of high fault rate, poor production continuity and limited capacity of the conventional thickener. By the thickening process, the operation period is short, the fault rate of equipment is low, the continuous operation period of a thickening system is as long as one year, and the production capacity of equipment is greatly improved, so that the thickening process has high industrial application value.

Description

technical field [0001] The invention relates to a thickening technology of crude adipic acid, in particular to a thickening technology of crude adipic acid using a static cluster thickener. Background technique [0002] Adipic acid, also known as hexanedicarboxylic acid, fatty acid (Adipic acid; Hexanedioic acid, referred to as AA) is the most important aliphatic dibasic acid, which can undergo condensation reaction with multifunctional compounds, such as industrial use of adipic acid Nylon 66 salt is produced by condensation reaction with hexamethylene diamine, and nylon 66 resin is obtained by further polycondensation. In addition, adipic acid can also react with alcohols to produce adipate esters, which are used as plasticizers, synthetic lubricants, and polyester polyols. Adipic acid is also used as an acidulant for various foods and beverages, as well as a raw material for medicine, yeast purification, pesticides, adhesives, synthetic leather, synthetic fuels, and frag...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C55/14C07C51/47B01D29/11B01D29/52B01D29/60
Inventor 汪浩张丰扬袁文张猛袁思彤
Owner CHINA TIANCHEN ENG
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