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US 5,710,307 AGranted
Process for the production of trialkyl phosphites
AssigneeBayer Aktiengesellschaft
InventorsWolfgang Ohlendorf, Hans-Dieter Block
Life of this patent
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Abstract
This invention relates to a process for the production of symmetrical trialkyl phosphites, which are also known as phosphorus acid trialkyl esters, from phosphorus trichloride and alcohol in the presence of an auxiliary base as an acid-binding agent and a solvent.
Claims16
A process for the production of trialkyl phosphites comprising the following steps:
- forming a reaction mixture consisting essentially of phosphorus trichloride, an alcohol, a solvent and an auxiliary base, characterised in that at least one alkyl amine having more than 10 carbon atoms is used as the auxiliary base, at least one alkyl aromatic having more than 50 wt. % of aromatic carbon atoms, a molecular weight of from 106 to 150 and a boiling point of below 220.degree. C. at standard pressure is used as the solvent and the alcohol has an alkyl group and a hydroxy group and the alkyl group of the alcohol is the same as the alkyl group of the trialkyl phosphite, and
- reacting the phosphorus trichloride with the alcohol in the solvent in the presence of the auxiliary base to form a reaction product.
A process for the production of a trialkyl phosphite comprising the following steps:
- a) forming a reaction mixture consisting essentially of phosphorus trichloride, an alcohol, a solvent and an auxiliary base, wherein said auxiliary-base is an alkylamine having more than 10 carbon atoms, said alcohol has an alkyl group and a hydroxy group and the alkyl group of the alcohol is the same as the alkyl group of the trialkyl phosphite, and said solvent is an alkyl aromatic having more than 50 wt. % of aromatic carbon atoms, a molecular weight of from 106 to 150 and a boiling point of below 220.degree. C. at standard pressure;
- b) reacting the phosphorus trichloride with the alcohol in the solvent in the presence of the auxiliary base to form a reaction product;
- and
- c) separating the trialkyl phosphite from the reaction product.
1 more element
Dependencies are inferred from the claim text.