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Novel continuous automated reaction process for preparing aminopolycarboxylic acids chelating agent

A technology of amino polycarboxylic acid and chelating agent, which is applied in the preparation of cyanide reaction, the preparation of organic compounds, organic chemistry, etc., to achieve the effect of stable quality, good quality and liberation of labor productivity

Active Publication Date: 2016-06-08
石家庄杰克化工有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The present invention is for solving the problem that can only adopt intermittent or semi-continuous mode to produce amino polycarboxylate chelating agent in the prior art, provides a kind of technology that can continuously automatic reaction prepare amino polycarboxylate chelating agent, not only improves The stability of the reaction process simplifies the treatment process of the by-product ammonia to increase its stability, and more importantly, it creates conditions for the automation of the production process and the improvement of equipment utilization.

Method used

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  • Novel continuous automated reaction process for preparing aminopolycarboxylic acids chelating agent

Examples

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Effect test

Embodiment 1

[0026]The flow rate of ethylenediamine is 600kg / h, the flow rate of 30% sodium cyanide solution is 6100L / h, the flow rate of 32% sodium hydroxide solution is 300L / h, continuously mix in the mixer, the mixed material passes through, and the heater is heated to 98°C , the content is 36.5% formaldehyde, the flow rate is 3260L / h, the flow rate of the mixed material is 6770L / h, mixed at the entrance of the reactor, enters the continuous reactor, the temperature in the reactor is controlled at 102°C, and the ammonia gas is under the condition of -30KPa Escape, the reaction liquid is pumped out from the bottom of the reactor with a feeding pump, and the residual cyanide and liquid phase quality of the reaction liquid are detected. The residual cyanide is less than 100ppm, and the liquid phase content is 95%, and the operation is stable.

Embodiment 2

[0028] The flow rate of hydroxyethylethylenediamine is 600kg / h, the flow rate of 30% sodium cyanide solution is 2600L / h, and the flow rate of 32% sodium hydroxide solution is 300L / h, continuously mixed in the mixer, the mixed material passes through, and the heater Heating to 102°C, the flow rate of 36.5% formaldehyde is 1420L / h, the flow rate of the mixed material is 3400L / h, mixed at the reactor inlet, enters the continuous reactor, the temperature in the reactor is controlled at 105°C, and the ammonia gas is at -25KPa Under the condition of escape, the reaction liquid is pumped out from the bottom of the reactor with a feeding pump, and the residual cyanide and liquid phase quality of the reaction liquid are detected. The residual cyanide in the reaction liquid is less than 100ppm, the liquid phase content is 98%, and the operation is stable.

Embodiment 3

[0030] The flow rate of ethanolamine is 600kg / h, the flow rate of 30% sodium cyanide is 3020L / h, the flow rate of 32% sodium hydroxide solution is 250L / h, continuously mixed in the mixer, the mixed material passes through, the heater is heated to 105 ° C, 36.5 The flow rate of % formaldehyde is 1620L / h, the flow rate of the mixed material is 3700L / h, mixed at the reactor inlet, enters the continuous reactor, controls the temperature in the reactor at 108°C, the ammonia gas escapes under the condition of -30KPa, and the reaction solution from The bottom of the reactor is pumped out with a feeding pump, and the residual cyanide and liquid phase quality of the reaction liquid are detected. The residual cyanide in the reaction liquid is less than 100ppm, and the liquid phase content is 98.9%, and the operation is stable.

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Abstract

The invention discloses a novel continuous automated reaction process for preparing an aminopolycarboxylic acids chelating agent and belongs to the technical field of aminopolycarboxylic acids chelating agents. Production is conducted through a flow reactor, a whole reaction system is under DCS automation control, and the process comprises the following steps: 1, material blending and mixing, wherein raw materials are continuously and stably pumped into a batcher for mixing, so that a liquid mixture is obtained; 2, preheating treatment, wherein the liquid mixture is pumped out of the batcher through a material delivering pump, and the liquid mixture which is pump out is subjected to heating treatment through a heater; 3, reaction and generation, wherein heated liquid materials and formaldehyde or heated liquid materials and a glycolonitrile solution are added into the reactor for a reaction, ammonia gas generated through the reaction is discharged through the top of the reactor and collected, and a reaction solution is drained through the bottom of the reactor and delivered to the acidification procedure for after-treatment through the material delivering pump, so that the aminopolycarboxylic acids chelating agent is obtained. By means of the process, the aminopolycarboxylic acids chelating agent can be produced in a continuous and automated mode, and stability of the reaction process is improved.

Description

technical field [0001] The invention belongs to the technical field of amino polycarboxylic acid chelating agents, and relates to a preparation process of amino polycarboxylic acid chelating agents, in particular to a new continuous automatic reaction process for preparing amino polycarboxylic acid chelating agents. The continuous automatic preparation of amino polycarboxylic acid chelating agents has been realized, which has completely changed the mode of batch production or semi-continuous production. The amino polycarboxylic acid chelating agents involved include EDTA (ethylenediaminetetraacetic acid) , DTPA (diethylenetriaminepentaacetic acid), HEDTA (N-hydroxyethylethylenediaminetriacetic acid), HIDA (monoethanolamine diacetic acid), GLDA (glutamic acid diacetic acid), NTA (nitrotriacetic acid). Background technique [0002] Amino polycarboxylic acid chelating agent is a widely used chemical product, which is used in cleaning, food, medicine, agriculture, water treatmen...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C227/26C07C229/16C07C229/24
CPCC07C227/26C07C229/16C07C229/24
Inventor 李红路马建兵李玉顺甄壮伟王建璞董伦郭会马学令
Owner 石家庄杰克化工有限公司
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