Prepn of soluble acephate powder

Acephate and powder-dissolving technology, which is applied in botany equipment and methods, animal repellants, biocides, etc., can solve the problems of large amount of organic extractant and high yield, and achieve low production cost and no Pollution, high yield effect

Inactive Publication Date: 2005-08-24
XIANGTAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In above-mentioned these methods except Chinese patent 1238340 and 1277201, all there is the problem of acephate former powder yield (corresponding mother liquor yield is big)
In addition, except for Chinese patent 1277201, it is necessary to treat a large amount of waste water containing organic phosphorus and other organic matter, and the amount of organic extractant is generally large

Method used

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  • Prepn of soluble acephate powder

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Experimental program
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Effect test

Embodiment 1

[0019] Be 94% O at 920kg content, add 55.2kg dimethyl sulfate in the crude oil of O-dimethyl phosphorothioate and carry out isomerization, then add the acetic anhydride that 682.6kg concentration is 98% (mass), at 55 ℃ The reaction was carried out for 3 hours to obtain acephate crude oil with 1658 content of 56.4%. Add 500kg of chloroform solvent to the crude oil, then neutralize it with 30% sodium hydroxide to pH 6.5-7.0, separate layers, and extract the water phase with 2617kg of solvent to obtain 4330kg of liquid with a content of 21.6%. Add 22kg of surfactant, 34kg of white carbon black, and spray dry at 70-75°C to obtain 1270kg, 73.4% acephate soluble powder.

Embodiment 2

[0021] In 880kg of 75% O, S-dimethylphosphoramide crude oil, adding 616kg of 98% acetic anhydride and 8.8kg of 98% sulfuric acid reacted at 55°C for 3 hours to obtain 1504.8kg Crude acephate content of 55-57%. Add 2865kg of solvent to the crude oil, then neutralize with ammonia gas to pH 6.5-7.0, filter the ammonium acetate crystals produced by neutralization, and obtain 3959.8kg of liquid with a content of 21.2%, add 20kg of surfactant, 30kg of white carbon black , spray-dried at 70-75°C to obtain 1145kg, 73.2% acephate soluble powder.

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Abstract

The present invention discloses a method to prepare the soluble powder of acetyl tomaron to the public, which use O,O-dimethyl thiphosphamide or O,S-dimethyl thiophosphamide as a raw material via the isomerization and acetylation of O,O-dimethyl thiophosphamide or the acetylatior of O,S-dimethyl thiophosphamide to prepare the raw oil of acetyl tomaran and then via neutralization, liquid-solid separation or extraction, addition of surface active agent and filler as well as drying to obtain the soluble powder of acetyl tomaron. The acetyl tomaron soluble powder prepared by the present invention has high yield, high pureficcation and has no pollution because the extracting liquid can be recovered for reusing.

Description

technical field [0001] The invention relates to a method for preparing soluble powder of acephate. Background technique [0002] Acephate, scientific name O, S-dimethyl-N-acetylthiophosphoramide, also known as N-acetylamino-O, S-dimethyl phosphate, the molecular structure is [0003] [0004] The pure product is a white crystal with a melting point of 92-93°C. It is a pesticide with high efficiency and low toxicity. [0005] The general content of acephate crude oil obtained by isomerization and acetylation of O, O-dimethylphosphoramide crude oil (or acetylation of O, S-dimethylphosphoramide crude oil) is 30- 70% (mass percentage), it is necessary to obtain commercially valuable acephate former powder or soluble powder through separation of inorganic acid and acetic acid. Foreign acephate soluble powder is prepared by adding acephate raw powder into solid filler and surfactant. [0006] Japanese patent JP-B48-34583 reports a method for separating and extracting acephat...

Claims

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Application Information

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Patent Type & AuthorityPatents(China)
IPC IPC(8): A01N25/14A01N57/28
Inventor罗和安王良芥刘平乐曾楚怡陈伟露熊鹰
OwnerXIANGTAN UNIV