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Process for preparing amino G acid

A preparation process, amino technology, applied in sulfonic acid preparation, organic chemistry, etc., can solve the problems of difficult tail gas treatment, high requirements, high production cost, etc., to improve product yield and content, shorten reaction time, and low acidity index Effect

Inactive Publication Date: 2012-03-28
湖北鑫慧化工有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When this method is used to generate, a large amount of hydrogen chloride will be generated, and the tail gas is difficult to handle; in addition, the pressure of the ammonification reaction is too high, so the requirements for the reactor are very high, and the production process has certain dangers.
Moreover, two streams of wastewater will be generated during the production process, and the wastewater treatment is difficult, resulting in high production costs. Therefore, some manufacturers discharge the wastewater directly in order to pursue profits, causing greater harm to the environment.

Method used

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  • Process for preparing amino G acid
  • Process for preparing amino G acid
  • Process for preparing amino G acid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] Add 100kg of 100% sulfuric acid and 100kg of 105% sulfuric acid into a 1000L enamel reaction kettle, add 150kg of 2-naphthol under stirring and cooling at 20°C, and react at 90°C for 6 hours after adding. After the reaction was completed, the sulfonated material was added to 370L of 20% ammonia solution, stirred for 2 hours, filtered, and centrifugally dehydrated to obtain 400 kg of 82% ammonium 6,8-naphthalene disulfonate. Add 9 kg of sodium chloride to 450 L of dehydration liquid to produce 8.5 kg of R salt. After filtration, the mother liquor is hydrolyzed at a high temperature of 160° C. to recover 0.88 kg of 2-naphthol.

[0044] In a 1000L stainless steel ammoniation reaction kettle, add 400 kg of the above ammonium 6,8-naphthalene disulfonate (G salt), 100L of 20% ammonia water, 300L of 20% ammonium sulfite solution, the detection index is 70.5g / L, and the jacket steam is heated To 140°C, the pressure inside the kettle was 0.6 MPa, and maintained for 8 hours. Aft...

Embodiment 2

[0047] In a 3000L enamel reaction kettle, add 615 kg of 100% sulfuric acid, 615 kg of 105% sulfuric acid, stir and cool at 20°C, add 922.5 kg of 2-naphthol, and react at 90°C for 6 hours after the addition is complete. After the reaction is complete, add the sulfonated material 2250L of 20% ammonia solution, stirred for 2 hours, filtered, and centrifugally dehydrated to obtain 2400 kg of 82% ammonium 6,8-naphthalene disulfonate. Add 110 kilograms of sodium chloride to 5500 L of dehydration liquid to produce 202 kilograms of R salt, and 22 kilograms of 2-naphthol are recovered by high-temperature hydrolysis of mother liquor water after filtration.

[0048] In a 5000L stainless steel ammoniation reaction kettle, add 2400 kg of the above ammonium 6,8-naphthalene disulfonate (G salt), 700L of 20% ammonia water, 1800L of 20% ammonium sulfite solution, the detection index is 70.1 g / L, and the jacket steam is heated to 142°C, the pressure in the kettle was 0.61 MPa, and maintained fo...

Embodiment 3

[0051] In a 3000L enamel reaction kettle, add 600 kg of 100% sulfuric acid, 600 kg of 105% sulfuric acid, stir and cool at 18°C, add 900 kg of 2-naphthol, and react at 90°C for 6 hours after the addition is complete. After the reaction is complete, add the sulfonated material 2190L of 20% ammonia solution, stirred for 2 hours, filtered, and centrifuged to obtain 2320 kg of 82% ammonium 6,8-naphthalene disulfonate. Add 99 kilograms of sodium chloride to 4950 L of dehydration liquid to produce 199 kilograms of R salt, and 22 kilograms of 2-naphthol are recovered by high-temperature hydrolysis of mother liquor water after filtration.

[0052]In a 5000L stainless steel ammoniation reaction kettle, add 2320 kg of the above-mentioned ammonium 6,8-naphthalene disulfonate (G salt), 680L of 20% ammonia water, 1700L of 20% ammonium sulfite solution, the detection index is 70g / L, and the jacket steam is heated to 138°C, the pressure in the kettle is 0.6 MPa, and keep it for 8 hours. Afte...

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Abstract

The invention relates to a process for preparing amino G acid, which belongs to the technical field of amino K acid production process. The process comprises the steps of sulfonating, salting out by ammoniacal liquor, treating G salt mother liquor, ammoniating G salt ammonium base sulfite, treating dehydrated liquid and the like, ammonium base sulfite is employed as a catalyst for replacing ammonium bisulfite, so that the pressure generated during ammonification process can be effectively reduced, the reaction time can be shortened, and the product yield and content can be increased. The method is characterized in that two streams of waste water are respectively treated, 2-naphthol is hydrolyzed and recovered by G salt mother liquor, neutralized for reaching the standard, and then exhausted; ammonium sulfate-rich effluent is used for producing fertilizer, and the zero discharge is realized. The unit consumption of the raw material 2-naphthol is decreased from 0.75 ton / ton in a traditional process to less than 0.64 ton / ton when the problem of waste water treatment is solved, so that the production cost is reduced, the production safety coefficient is high and no harmful gas is discharged. The process of the invention solves the problems that two streams of waste water are generated during the present production process, the difficulty of waste water treatment is large, the production cost is high and the large harm on environment is caused.

Description

technical field [0001] The invention relates to a preparation process of amino G acid, which belongs to the technical field of amino K acid production technology. Background technique [0002] Amino G acid (2-naphthylamine-6,8-disulfonic acid) is an important dye intermediate, industrially using amino G acid can synthesize a variety of dyes, such as CI direct orange 74, CI media yellow 80, CI acid red 47 etc. Amino G acid can be used as raw material to synthesize R acid (3-hydroxy-2,7-naphthalene disulfonic acid) through alkali fusion reaction, or amino K acid (2-naphthylamine-3,6,8- trisulfonic acid), and further synthesized 2R acid (3-amino-5-hydroxy-2,7-naphthalene disulfonic acid) by alkali fusion reaction. [0003] Amino G acid is usually synthesized by 2-naphthol plus sulfuric acid and nicotinic acid disulfonation, plus potassium chloride to form potassium salt crystallization (G salt), and G salt is synthesized by pressurized ammoniation reaction, using ammonium bis...

Claims

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Application Information

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IPC IPC(8): C07C309/47C07C303/02
Inventor 范明华张伟东
Owner 湖北鑫慧化工有限公司
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