High productivity process for alkylphenol ethoxylates
View Patent ↗The present invention provides a process for the production of an alkylphenol ethoxylate involving charging a portion of product from a previous preparation (a “heel”) or an ethoxylate to a reactor, optionally, charging from about 0.2 wt. % to an amount equal to or greater than the weight of the heel of an alkylphenol starter to the reactor, charging ethylene oxide to activate a double metal cyanide (“DMC”) catalyst, adding the alkylphenol starter simultaneously with ethylene oxide for a portion of the process and continuing ethylene oxide addition following completion of the simultaneous alkylphenol starter and ethylene oxide addition. The process of the present invention provides significant improvements in cycle time and safety in producing ethoxylates which may find use in or as surfactants.
1. A process for the production of an alkylphenol ethoxylate comprising:
charging a portion of product from a previous preparation (a “heel”) or an ethoxylate to a reactor;
optionally, charging from about 0.2 wt. % to an amount equal to or greater than the amount of heel, of an alkylphenol starter to the reactor;
charging ethylene oxide to activate a double metal cyanide (“DMC”) catalyst;
adding the alkylphenol starter simultaneously with ethylene oxide for a portion of the process; and
continuing ethylene oxide addition following completion of simultaneous alkylphenol starter and ethylene oxide addition.
2. The process according to claim 1 , wherein the alkylphenol starter alkyl group contains from 1 to 20 carbon atoms.
3. The process according to claim 1 , wherein the alkylphenol starter alkyl group contains from 3 to 13 carbon atoms.
4. The process according to claim 1 , wherein the alkylphenol starter is selected from nonylphenols, octylphenols and dodecylphenols.
5. The process according to claim 1 , wherein the alkylphenol ethoxylate has a number average molecular weight of from about 150 Da to about 20,000 Da.
6. The process according to claim 1 , wherein the alkylphenol ethoxylate has a number average molecular weight of from about 250 Da to about 12,000 Da.
7. The process according to claim 1 , wherein the alkylphenol ethoxylate has a number average molecular weight of from about 350 Da to about 750 Da.