Claims
- 1. A process for the production of a pseudo-boehmite product which comprises initially mixing an alkali aluminate and a halohydrin selected from the gorup consisting of ethylene chlorohydrin, propylene chlorohydrin, epichlorohydrin, trimethylene chlorohydrin, glycerol monochlorohydrin, glycerol dichlorohydrin, and 1-hydroxy-2-chloropropyl-methacrylate for a period of 5 seconds to 10 hours at a temperature of from -10.degree. C. to 50.degree. C., the molar ratio of halohydrin to alkali aluminate being from 0.8 to 20, the concentration of alkali aluminate being up to 25% by weight, and thereafter raising the temperature of the mixture to from 50.degree. C. to 100.degree. C. to effect precipitation of the desired pseudo-boehmite; said pseudo-boehmite characterized by the following physical properties:
- (a) bulk density, 0.05 to 0.2 g/cc;
- (b) oil absorption, 2.5 to 6.0 cc/g;
- (c) specific surface area, 200 to 500 m.sup.2 /g;
- (d) pore volume, 2.0 to 7.0 cc/g (0.0035.mu.-176.mu.);
- (e) Pore volume, 2.0 to 4.0 cc/g (0.176.mu.-176.mu.).
- 2. A process as in claim 1 wherein the precipitated pseudo-boehmite is washed with an organic solvent selected from a group consisting of acetone and an alcohol having from 1 to 5 carbon atoms.
- 3. A process as claimed in claim 1 wherein precipitation is effected at a temperature of 60.degree. C. to 90.degree. C.
- 4. A process as claimed in claim 1 wherein the alkali aluminate is sodium aluminate or potassium aluminate.
- 5. A process as claimed in claim 1 wherein the alkali aluminate has an atomic ratio of alkali to aluminum of 1:1 to 1.5:1 and contains excess alkali.
- 6. A process as claimed in claim 1 wherein the concentration of alkali aluminate is from 1 to 20% by weight.
- 7. A process as claimed in claim 1 wherein the concentration of alkali aluminate is from 5 to 15% by weight.
- 8. A process as claimed in claim 1 wherein the molar ratio of halohydrin to alkali aluminate is from 0.8 to 20.
- 9. A process as claimed in claim 1 wherein the molar ratio of halohydrin to alkali aluminate is from 0.9 to 10.
- 10. A process as in claim 1 wherein excess alkali, when present, is neutralized with mineral acid or gaseous carbon dioxide.
Priority Claims (1)
Number |
Date |
Country |
Kind |
48/38774 |
Apr 1973 |
JPX |
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RELATED APPLICATIONS
This application is a continuation-in-part application of copending application, Ser. No. 683,520 filed May 5, 1976, which is in turn a continuation of copending application, Ser. No. 456,389, filed Mar. 29, 1974, both now abandoned.
US Referenced Citations (10)
Foreign Referenced Citations (1)
Number |
Date |
Country |
43-30,180 |
Dec 1968 |
JPX |
Continuations (1)
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Number |
Date |
Country |
Parent |
456389 |
Mar 1974 |
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Continuation in Parts (1)
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Number |
Date |
Country |
Parent |
683520 |
May 1976 |
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