Water processes for producing polyether polyols from solid polyhydroxyl compounds
AssigneeCovestro LLC
InventorsAnthony R. Loveday, Daniel R. Wagner
Life of this patent
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Abstract
Batch “water processes” for producing high functionality polyether polyols from polyhydroxyl compounds that are solid at ambient conditions, such as is the case with sucrose, are disclosed. The disclosed processes avoid use of an intermediate dewatering step.
Claims23
A batch process for producing a polyether polyol having an arithmetically calculated functionality of 1.9 to 5.8 and an OH number of 360 mg KOH/g polyol to 725 mg KOH/g polyol by an alkoxylation reaction, comprising:
- (a) providing a slurry that:
- (i) has a temperature of from 80° C. to 150° C., and
- (ii) consists essentially of:
- (1) a polyhydroxyl compound which melts above 95° C. or decomposes before melting and has a hydroxyl group functionality greater than or equal to 4,
- (2) water present in an amount of at least 0.09 grams of water per gram of the polyhydroxyl compound and less than the amount necessary to solubilize all of the polyhydroxyl compound in the slurry at the temperature of the slurry at the commencement of the alkoxylation reaction, and
- (3) an alkali metal hydroxide, and
- (b) reacting the slurry of step (a) with an alkylene oxide to form the polyether polyol,
- wherein the process does not include a dewatering step prior to completion of step (b).
A batch process for producing a polyether polyol having an arithmetically calculated functionality of 1.9 to 5.8 and an OH number of 360 mg KOH/g polyol to 725 mg KOH/g polyol, comprising:
- (a) providing a slurry that:
- (i) has a temperature of from 80° C. to 150° C., and
- (ii) consists essentially of:
- (1) a polyhydroxyl compound which melts above 95° C. or decomposes before melting and has a hydroxyl group functionality greater than or equal to 4,
- (2) water present in an amount of at least 0.09 and less than 0.20 grams of water per gram of the polyhydroxyl compound, and
- (3) an alkali metal hydroxide, and
- (b) reacting the slurry of step (a) with an alkylene oxide to form the polyether polyol,
- wherein the process does not include a dewatering step prior to completion of step (b).
Dependencies are inferred from the claim text.