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Prepn. of methionine

A technology of methionine and potassium carbonate, applied in the preparation of organic compounds, chemical instruments and methods, hydrogenated polysulfide/polysulfide preparation, etc., can solve problems such as many acnes, complicated equipment, and difficult methionine treatment, and achieve Easy crystal form, large volume ratio effect

Inactive Publication Date: 2004-12-08
SUMITOMO CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

And there are many acnes, methionine is not easy to deal with
As an improved method, the scale-like methionine can be recrystallized to obtain plate-like methionine crystals with a large volume ratio, but this method requires complicated equipment and is not an economical method

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] In the presence of potassium carbonate, the hydrolyzate obtained after hydrolysis of 5-(β-methylmercaptoethyl)hydantoin is neutralized with carbon dioxide in a 30-liter crystallization tank with a sleeve, and methionine is obtained after crystallization .

[0020] Initially add 10 liters of hydrolyzate containing 16.8wt% methionine potassium salt and 200 milliliters of 2wt% polyvinyl alcohol aqueous solution (compared with methionine, polyvinyl alcohol is 3000ppm) as coagulant in the crystallization tank, at 20 ℃, Batch crystallization was carried out for 40 minutes under the condition that the carbon dioxide pressure was 0.4 Mpa and the stirring power per unit liquid volume was 0.7 kW / m3.

[0021] Then, 330 ml / min of hydrolyzate and 3.3 ml / min of polyvinyl alcohol aqueous solution (compared with methionine, polyvinyl alcohol is 1500ppm) are continuously supplied to the crystallization tank. The semi-continuous crystallization was carried out for 60 minutes under the c...

Embodiment 2

[0024] Except using sorbitan laurate and hydroxypropyl methylcellulose instead of polyvinyl alcohol as coagulant, other steps are the same as in Example 1.

[0025] The volume specific gravity of methionine thus obtained was 0.52 and 0.53, respectively.

Embodiment 3

[0036] As in Example 1, a part of the liquid was taken out at regular intervals, filtered, washed with water, and dried to obtain methionine. Table 3 shows the volume specific gravity of methionine at regular intervals.

[0037] 【table 3】

[0038] batch crystallization

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PUM

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Abstract

The present invention prepares easy to treat methionine with good crystal form and great bulk specific weight through the hydrolysis of 5-(beta-methylmercaptoethyl) hydantoin and the neutralization of hydrolysate with CO2 to separate methionine crystal. It features the continuous crystal separation in a crystal separating tank with casing. First, 15-40% of the hydrolysate and coagulant are filled in the tank and stirred while leading CO2 in so as to separate partial crystal, and then the rest hydrolysate, coagulant and CO2 is filled for continuous crystal separation.

Description

technical field [0001] The invention relates to a method for preparing methionine, in particular to a method for preparing methionine with good crystal form and high volume ratio. Methionine is mainly used as a feed additive for animals. Background technique [0002] The known preparation method of methionine is to hydrolyze 5-(β-methylmercaptoethyl)hydantoin in the presence of potassium carbonate, and then pass carbon dioxide into the hydrolyzate for neutralization to make methionine crystallization, separation, A cycle process of hydantoin hydrolysis by concentrating the filtrate (JP-A-54-9174). [0003] However, the crystals of methionine obtained by the above method are in the form of scales and have a small specific gravity of only 0.3 to 0.4. Moreover, there are many acnes, and methionine is not easy to deal with. As an improved method, the scale-like methionine can be recrystallized to obtain plate-like methionine crystals with a large specific volume, but this met...

Claims

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Application Information

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IPC IPC(8): C07C319/22C07C319/28C07C323/58
Inventor 福田雅充安部正
Owner SUMITOMO CHEM CO LTD
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