Unlock instant, AI-driven research and patent intelligence for your innovation.

Decolorization method of amino carboxylate feed liquid prepared by organic nitrile compound through alkaline hydrolysis

A technology of amino carboxylate and nitrile compounds, which is applied in the field of decolorization of chemical synthesis feed liquid, which can solve the problems of inability to remove colored impurities, harsh decolorization conditions, and large investment in equipment, and achieve good decolorization effect, low operating cost and low dosage low effect

Active Publication Date: 2016-05-11
CHONGQING UNISPLENDOUR CHEM
View PDF4 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, the organic solvent extraction method cannot remove the colored impurities from the aminocarboxylate aqueous solution well because of the good water solubility of the above-mentioned colored impurities, and the decolorization effect is poor; the ion exchange resin method, the macroporous adsorption resin method and the membrane decolorization method Although a good decolorization effect can be achieved, the decolorization conditions are relatively harsh, the investment in equipment is large, and the regeneration of resin and membrane will generate a large amount of waste water, and the replacement of resin and membrane will also produce solid waste that is difficult to handle; A large amount of activated carbon is required to obtain a better decolorization effect, resulting in a large amount of activated carbon solid waste

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Decolorization method of amino carboxylate feed liquid prepared by organic nitrile compound through alkaline hydrolysis
  • Decolorization method of amino carboxylate feed liquid prepared by organic nitrile compound through alkaline hydrolysis

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] The mass fraction is 42% of the aqueous solution of hydroxyacetonitrile and the mass fraction of 25% of ammonia to react to obtain the ammonia solution of aminoacetonitrile, and the latter is hydrolyzed with 50% of the mass fraction of sodium hydroxide solution to obtain the sodium glycinate feed solution . The feed liquid is dark brown liquid (such as figure 1 shown), which contains 15% to 16% of sodium glycinate, 1% to 2% of disodium iminodiacetate (IDA-2Na) and ≤0.5% of trisodium nitrogen triacetate (NTA-3Na) in terms of mass percentage.

[0022] Take 812.8 grams of the above-mentioned sodium glycinate feed solution, heat it to 80°C, add 10ml of hydrogen peroxide at one time under stirring conditions, and keep stirring at 80°C for 30 minutes (after adding hydrogen peroxide for 10 minutes, it can be seen that the color of the feed solution changes from dark brown to reddish brown, Then as time prolongs, the color of the feed liquid gradually becomes lighter), then co...

Embodiment 2

[0031] The mass fraction is 40% hydroxyacetonitrile aqueous solution and the mass fraction is 33% methylamine aqueous solution reaction, obtains the aqueous solution of N-methylaminoacetonitrile, and the latter is hydrolyzed reaction with the mass fraction of 50% sodium hydroxide aqueous solution again, Obtain N-methyl glycinate sodium feed solution. The feed liquid is a dark brown liquid, which contains 18% of sodium N-methylglycinate by mass percentage.

[0032] Take 812.8 grams of the above-mentioned sodium N-methylglycine feed solution, heat it to 80°C, add 8ml of hydrogen peroxide at one time under stirring conditions, and keep stirring at 80°C for 30 minutes (after adding hydrogen peroxide for 10 minutes, it can be seen that the color of the feed solution changes from dark brown to It is reddish brown, and then as time goes on, the color of the feed liquid gradually becomes lighter), then cool to 60°C, add 1.8 grams of activated carbon, keep stirring at 60°C for 30 minut...

Embodiment 3

[0034] The mass fraction is 40% hydroxyacetonitrile aqueous solution and the mass fraction is 33% dimethylamine aqueous solution reaction, obtains the aqueous solution of N,N-dimethylaminoacetonitrile, and the latter is then mixed with the mass fraction is 50% sodium hydroxide aqueous solution A hydrolysis reaction occurs to obtain a feed solution of N,N-dimethylglycinate sodium. The feed liquid is a dark brown liquid, which contains 20% of N,N-dimethylglycine sodium in terms of mass percentage.

[0035] Take 812.8 grams of the above-mentioned N,N-dimethylglycine sodium feed solution, heat it to 80°C, add 10ml of hydrogen peroxide at one time under stirring conditions, and keep stirring at 80°C for 30 minutes (after adding hydrogen peroxide for 10 minutes, it can be seen that the color of the feed solution changes from Dark brown to reddish brown, and then as time goes on, the color of the feed liquid gradually becomes lighter), then cool to 60°C, add 1.8 grams of activated ca...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention discloses a decoloring method of an amino carboxylate feed liquid prepared through alkaline hydrolysis of an organic nitrile compound. The decoloring method comprises the following steps: firstly, adding an oxidizing agent into the amino carboxylate feed liquid to oxidize and decolor; then, adding activated carbon to adsorb and decolor; and combining oxidative decolorization of the oxidizing agent with adsorptive decolorization of the activated carbon. Therefore, not only is the decoloring effect good to greatly reduce the loss of amino carboxylate in the decoloring process greatly, but also the method is simple to operate, low in use level of the activated carbon, low in operating cost and safe and reliable in production.

Description

technical field [0001] The invention belongs to the field of fine chemical industry and relates to a method for decolorizing chemical synthesis material liquid. Background technique [0002] Amino carboxylate compounds can be prepared by alkaline hydrolysis of organic nitrile compounds. For example, sodium glycinate can be prepared by reacting hydroxyacetonitrile and ammonia water to produce aminoacetonitrile, which is then prepared by alkaline hydrolysis under the action of inorganic bases. During the reaction process, since the cyano group is prone to polymerize under alkaline conditions to generate colored impurities, it is necessary to decolorize the feed liquid obtained from the reaction. There are many decolorization methods, such as ion exchange resin method, macroporous adsorption resin method, activated carbon adsorption method, membrane decolorization method, organic solvent extraction method, etc. Among them, the organic solvent extraction method cannot remove th...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): C07C227/40C07C229/08C07C229/12C07C229/16
Inventor 吴传隆郑道敏秦岭朱丽利姚如杰杨帆王用贵李欧
Owner CHONGQING UNISPLENDOUR CHEM