Method for environment-friendly clean production of D,L-methionine

A clean production and methionine technology, applied in the chemical industry, can solve problems such as energy waste and cycle problems, and achieve the effects of low cost, simple operation, and high utilization rate of raw materials

Inactive Publication Date: 2017-02-22
NINGXIA UNISPLENDOUR TIANHUA METHIONINE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] The purpose of the present invention is to provide an environmentally friendly and clean production method of D,L-methionine, which can overcome the problems of traditional D,L-...

Method used

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  • Method for environment-friendly clean production of D,L-methionine

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Experimental program
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Effect test

Embodiment 1

[0031] Take 3484.4 grams of 5-(2-methylthioethyl)-hydantoin aqueous solution and add it to the autoclave, wherein 5-(2-methylthioethyl)-hydantoin 696.88 grams (4mol) , then add 1658.4 grams of potassium carbonate aqueous solution with a mass fraction of 50%, close the autoclave, immediately raise the temperature to 180 ° C, keep the temperature for 20 minutes, and then release the pressure to normal pressure. The residual ammonia is less than 50ppm; carbon dioxide is passed into the saponified liquid after deammonification, the pressure of carbon dioxide is 0.5MPa, the neutralization temperature is 20°C, and the pH at the neutralization end point is 6.8, the crystals are suction filtered, washed with a small amount of water, and obtained The wet product of methionine is dried to obtain 415.9 grams of methionine product with a content of 99.3%; the washing water is combined with the mother liquor of suction filtration to obtain 3659.44 grams of potassium bicarbonate aqueous solu...

Embodiment 2

[0036] Take 3484.4 grams of 5-(2-methylthioethyl)-hydantoin aqueous solution and add it to the autoclave, wherein 5-(2-methylthioethyl)-hydantoin 696.88 grams (4mol) , then add 1474.13 grams of potassium carbonate aqueous solution with a mass fraction of 60%, close the autoclave, immediately heat up to 185 ° C, keep the temperature for 15 minutes, and then release the pressure to normal pressure. The residual ammonia is less than 40ppm; carbon dioxide is passed into the saponified liquid after deammonification, the pressure of carbon dioxide is 0.8MPa, the neutralization temperature is 15°C, and the pH at the neutralization end point is 6.0, the crystals are filtered by suction, washed with a small amount of water, and obtained The wet product of methionine is dried to obtain 445.65 grams of methionine product with a content of 99.3%; the washing water is combined with the mother liquor of suction filtration to obtain 3725 grams of potassium bicarbonate aqueous solution contain...

Embodiment 3

[0041] Take 3484.4 grams of 5-(2-methylthioethyl)-hydantoin aqueous solution and add it to the autoclave, wherein 5-(2-methylthioethyl)-hydantoin 696.88 grams (4mol) , then add 1474.13 grams of potassium carbonate aqueous solution with a mass fraction of 60%, close the autoclave, immediately heat up to 185 ° C, keep the temperature for 15 minutes, and then release the pressure to normal pressure. The residual ammonia of ammonia is less than 40ppm; carbon dioxide is introduced into the saponified liquid after deamination, the pressure of carbon dioxide is 0.8MPa, the neutralization temperature is 15°C, the pH of the neutralization end point is 6.0, and the crystals are filtered by suction to obtain the wet product of methionine , the obtained wet product is recrystallized, the crystals are suction filtered, and dried to obtain 312.0 grams of methionine product with a content of 99.6%. The obtained methionine product is analyzed by scanning electron microscope, as shown in figur...

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Abstract

A method for environment-friendly clean production of D,L-methionine includes: performing alkaline hydrolysis of 5-(2-methylmercaptoethyl)-hydantoin to obtain carbonate-containing methionine alkali metal saponified solution; then feeding carbon dioxide, crystallizing, and separating to respectively obtain methionine and hydrocarbonate water solution of methionine; subjecting the hydrocarbonate water solution of methionine to chromatographic separation. The method has advantages that loss of D,L-methionine due to pyrolysis can be reduced, simplicity in operation, low cost and high utilization rate of raw materials are realized, high efficiency in acquisition of high-purity methionine crystals is achieved, the purity of the obtained methionine is up to 99.4%, the methionine recovery rate reaches 97%, and the desalinization rate reaches 98% or above. In addition, accumulation of a great quantity of impurities of methionine-containing potassium bicarbonate mother liquor and emission of the potassium bicarbonate mother liquor are avoided, discharge of saline wastewater is avoided, and accordingly environment friendliness and clean production are realized. In a whole process, potassium carbonate serving as a hydrolysis agent is recycled without loss, and replenishment of alkaline potassium compounds is avoided.

Description

technical field [0001] The invention belongs to the field of chemical industry, and in particular relates to an environmentally friendly and clean production method of D,L-methionine. Background technique [0002] Methionine (DL-Methionine) chemical formula is C 5 h 11 o 2 NS, white flake crystal or crystalline powder, with special smell and slightly sweet taste. Used in nutritional supplements, added to oats, rye, rice, corn, wheat, peanut flour, soybeans, potatoes, spinach and other foods to improve amino acid balance, the requirement varies with cystine intake, adult men need The amount is 1.1g / d. It is also used for amino acid infusion and comprehensive amino acid preparations. It can be used as a spice according to the regulations of GB2760-86 in my country. It is also an essential animal feed additive. Animal feed added with methionine can help animals grow rapidly in a short period of time. It saves about 40% of feed. The lack of methionine in livestock and poult...

Claims

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Application Information

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IPC IPC(8): C07C319/20C07C319/28C07C323/58
CPCY02P20/582C07C319/20C07C319/28C07C323/58
Inventor 吴传隆郑道敏姚如杰万霞秦岭
Owner NINGXIA UNISPLENDOUR TIANHUA METHIONINE CO LTD
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