Reduced odor esters and process for producing same
AssigneeFinetex, Inc.
InventorsIsmail Walele, Samad A. Syed
Life of this patent
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Abstract
An improved process for preparing reduced-odor or odorless esters, preferably benzoate esters, octanoate esters, aliphatic emollient esters and glycol dibenzoate esters. The improved process comprises, in part, removing the esterification catalyst from the crude ester after the esterification reaction is substantially complete, before neutralization of acidity. The resultant ester compositions are odorless or have substantially reduced odor as compared to commercially available esters.
Claims43
A method of reducing or eliminating odor in an ester composition comprising a crude ester and an esterification catalyst comprising the step of removing said catalyst from the crude ester and then adding alkali to neutralize acidity.
In a process for preparing odorless, colorless esters from an esterification reaction mixture obtained by reacting an acid and an alcohol in the presence of an effective amount of a catalyst, which comprises adding alkali to the esterification reaction mixture and washing the ester, the improvement which comprises removing said catalyst from said reaction mixture prior to addition of alkali and which further comprises contacting the wet, crude ester with a bleaching agent, after neutralization with said alkali is completed.
In a process for preparing reduced-odor benzoate esters from an esterification reaction mixture obtained by reacting benzoic acid with an alcohol in the presence of an effective amount of a catalyst, which comprises the steps of:
- heating said reaction mixture;
- collecting distillate comprising the water of reaction;
- neutralizing and washing the acidity of said reaction mixture with at least one alkali;
- drying said ester;
- and
- filtering the refined ester product;
- the improvement comprising removing said catalyst from said reaction mixture after the reaction is complete, and before neutralization.
The process of claim 5 wherein said catalyst comprises an organometallic compound or metal oxide compound.
In a process for preparing reduced-odor benzoate esters from an esterification reaction mixture obtained by reacting benzoic acid with an alcohol in the presence of an effective amount of a catalyst, which comprises the steps of:
- heating said reaction mixture;
- collecting distillate comprising the water of reaction;
- neutralizing and washing the acidity of said reaction mixture with at least one alkali;
- drying said ester;
- and
- filtering the refined ester product;
- the improvement comprising removing said catalyst from said reaction mixture after the reaction is complete, and before neutralization, and wherein after said neutralization is completed, contacting the wet, crude ester with a bleaching agent.
In a process for preparing reduced-odor benzoate esters from an esterification reaction mixture obtained by reacting benzoic acid with an alcohol in the presence of an effective amount of a catalyst, which comprises the steps of:
- beating said reaction mixture;
- collecting distillate comprising the water of reaction;
- neutralizing and washing the acidity of said reaction mixture with at least one alkali;
- drying said ester;
- and
- filtering the refined ester product;
- the improvement comprising removing said catalyst from said reaction mixture after the reaction is complete, and before neutralization, and wherein said wet, crude ester is contacted with a bleaching agent in a first or subsequent washing step, after neutralization is complete.
In a process for preparing reduced-odor octanoate esters from an esterification reaction mixture obtained by reacting ethylhexanoic acid with an alcohol in the presence of an effective amount of a catalyst, which comprises the steps of:
- heating said reaction mixture;
- collecting distillate comprising the water of reaction;
- neutralizing and washing the acidity of said reaction mixture with at least one alkali;
- drying said ester;
- and filtering the refined ester product;
- the improvement comprising removing said catalyst from said reaction mixture after the reaction is complete, and before neutralization.
In a process for preparing reduced-odor octanoate esters from an esterification reaction mixture obtained by reacting ethylhexanoic acid with an alcohol in the presence of an effective amount of a catalyst, which comprises the steps of:
- heating said reaction mixture;
- collecting distillate comprising the water of reaction;
- neutralizing and washing the acidity of said reaction mixture with at least one alkali;
- drying said ester;
- and
- filtering the refined ester product;
- the improvement comprising removing said catalyst from said reaction mixture after the reaction is complete, and before neutralization, and wherein after said neutralization is completed, contacting the wet, crude ester with a bleaching agent.
In a process for preparing reduced odor aliphatic, emollient esters from an esterification reaction mixture obtained by reacting a carboxylic acid with an alcohol in the presence of an effective amount of a catalyst, which comprises the steps of:
- heating said reaction mixture;
- collecting distillate comprising the water of reaction;
- neutralizing and washing the acidity of said reaction mixture with at least one alkali;
- drying said ester;
- and
- filtering the refined ester product;
- the improvement comprising removing said catalyst from said reaction mixture after the reaction is complete, and before neutralization.
In a process for preparing reduced odor aliphatic, emollient esters from an esterification reaction mixture obtained by reacting a carboxylic acid with an alcohol in the presence of an effective amount of a catalyst, wherein said alcohol comprises from 3 to 22 carbon atoms and wherein said carboxylic acid comprises linear or branched carboxylic acids with 4 to 22 carbon atoms, which comprises the steps of:
- heating said reaction mixture;
- collecting distillate comprising the water of reaction;
- neutralizing and washing the acidity of said reaction mixture with at least one alkali;
- drying said ester;
- and
- filtering the refined ester product;
- the improvement comprising removing said catalyst from said reaction mixture after the reaction is complete, and before neutralization, and wherein after said neutralization is completed, contacting the wet, crude ester with a bleaching agent.
In a process for preparing reduced odor glycol dibenozate ester from an esterification reaction mixture obtained by reacting a glycol with benzoic acid in the presence of an effective amount of a catalyst, which comprises the steps of:
- heating said reaction mixture;
- collecting distillate comprising the water of reaction;
- neutralizing and washing the acidity of said reaction mixture with at least one alkali;
- drying said ester;
- and
- filtering the refined ester product;
- the improvement comprising removing said catalyst from said reaction mixture after the reaction is complete, and before neutralization.
In a process for preparing reduced odor glycol dibenozate esters from an esterification reaction mixture obtained by reacting a glycol with benzoic acid in the presence of an effective amount of a catalyst, which comprises the steps of:
- heating said reaction mixture;
- collecting distillate comprising the water of reaction;
- neutralizing and washing the acidity of said reaction mixture with at least one alkali;
- drying said ester;
- and
- filtering the refined ester product;
- the improvement comprising removing said catalyst from said reaction mixture after the reaction is complete, and before neutralization, and wherein after said neutralization is completed, contacting the wet, crude ester with a bleaching agent.
Dependencies are inferred from the claim text.