A kind of industrial production method of bis(2,6-di-tert-butyl-4-methylphenyl)pentaerythritol phosphite

Abstract

The invention relates to an industrial production method of bis(2,6-ditertiary butyl-4-methyl phenyl) pentaerythritol phosphite. The method comprises the following steps: preparing 2,6-ditertiary butyl-4-methyl hydroxybenzene sodium salt from 2,6-ditertiary butyl-4-methyl hydroxybenzene, sodium methylate and an organic solvent in a primary reaction kettle; preparing a dichlorodiphosphite pentaerythritol ester solution from pentaerythritol, phosphorus trichloride and an organic solvent in a secondary reaction kettle; then adding the 2,6-ditertiary butyl-4-methyl hydroxybenzene sodium salt prepared in the primary reaction kettle into the secondary reaction kettle to prepare a bis(2,6-ditertiary butyl-4-methyl phenyl) pentaerythritol phosphite reaction solution; and then carrying out centrifugalization and impurity removal, freezing, crystallization and separation, centrifugalization and desolvation and drying to obtain the bis(2,6-ditertiary butyl-4-methyl phenyl) pentaerythritol phosphite product. The method is low in cost of raw materials, simple to operate, mild in reaction condition, short in production period of product, high in production efficiency, economical and environmentally friendly and quite suitable for industrial production.

Description

technical field [0001] The invention relates to an industrial production method of bis(2,6-di-tert-butyl-4-methylphenyl)pentaerythritol phosphite, which belongs to the field of organic chemical preparation. Background technique [0002] Antioxidants are important additives in the processing and application of polymer resins, and their applications involve almost all polymers and their material products. With the rapid increase in the output of synthetic materials worldwide, especially general-purpose plastics, the rapid growth of global antioxidant production capacity has been promoted and stimulated. The average annual growth rate of plastic antioxidant production has remained at about 8%, higher than other traditional The growth rate of plastic additives. [0003] Phosphite antioxidant is a kind of antioxidant, which generates stable inactive products by decomposing peroxides produced in the oxidation process, thereby delaying the oxidation process of polymer materials an...

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Problems solved by technology

Disclosed in CN102206234: use pentaerythritol, phosphorus trichloride as raw material, pyridine as catalyst, carry out cyclization reaction to generate pentaerythritol dichlorodiphosphite, and then replace with hindered phenol under the catalysis of triethylamine or tributylamine The reaction generates pentaerythritol bisphosphite. In this reaction, pyridine, triethylamine, and tributylamine are used as catalysts, and triethylamine substances are used as acid-binding agents. The post-treatment process of the synthesis is cumbersome, and the separation and recovery of the catalyst after the reaction It is very difficult, and pyridine is a highly flammable liquid, which is harmful to aquatic organisms and is very dangerous. It is easy to pollute the environment and is not suitable for industrial production.

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