Method for the preparation of low overbased alkyltoluene sulfonate

摘要

Disclosed is a method for improving filtration in the preparation of an alkaline earth metal alkyltoluene sulfonate concentrate by selectively controlling the meta, ortho, para isomer distribution of the alkyl group of the alkyltoluene produced by the process comprising alkylating toluene with at least one isomerized normal alpha olefin, having from about 18 to about 30 carbon atoms and having from 20% to 100% branching in an alkylation process which includes monitoring % isomer formation and adjusting an alkylation process parameter in order to provide a target specified isomer content of less than 38% meta-isomer content; and thereafter sulfonating and neutralizing to produce a low base number sulfonated alkyltoluene concentrate having a Base Number of about 2 to 60 (ASTM D 2896).

主权项

1. A method for improving filterability in the preparation of an alkaline earth metal alkyltoluene sulfonate concentrate which comprises:
(a) monitoring the isomeric distribution of at least one alkyltoluene produced by alkylating toluene with an olefin comprising at least one isomerized normal alpha olefin, said isomerized normal alpha olefin having from about 18 to about 30 carbon atoms and having from 15% to 100% branching; (b) adjusting at least one alkylation process parameter in order to provide a target isomer distribution having a 2-tolyl C24 isomer content of less than 38% meta, relative to the total 2-tolyl C24 isomer content, wherein the at least one alkylation process parameter is selected from the group consisting of adjusting the feed temperature of at least one reactant, adjusting the charge mole ratio of the reactants, and adjusting the weight hourly space velocity of the feed; (c) sulfonating the alkyltoluene to produce an alkyltoluene sulfonic acid; (d) neutralizing the alkyltoluene sulfonic acid with a source of an alkaline earth al to provide a neutralized alkyltoluene sulfonate concentrate having a base number of from about 2 to about 60.