Methods for preparing diol

Patent metadata

Field	Value
Publication number	US-10464870-B2
Application number	US-201515514980-A
Country	US
Kind code	B2
Filing date	Sep 23, 2015
Priority date	Sep 28, 2014
Publication date	Nov 5, 2019
Grant date	Nov 5, 2019

Abstract

Provided is a method for preparing a diol. In the method, a saccharide and hydrogen as raw materials are contacted with a catalyst in water to prepare the diol. The employed catalyst is a composite catalyst comprised of a main catalyst and a cocatalyst, wherein the main catalyst is a water-insoluble acid-resistant alloy; and the cocatalyst is a soluble tungstate and/or soluble tungsten compound. The method uses an acid-resistant, inexpensive and stable alloy needless of a support as a main catalyst, and can guarantee a high yield of the diol in the case where the production cost is relatively low.

First claim

The invention claimed is:

1. A method for preparing a diol comprising contacting a sugar and hydrogen with a catalyst in water in a reactor to prepare a diol;
wherein the catalyst is a composite catalyst consisting of a main catalyst and a cocatalyst;
the main catalyst is a water-insoluble acid-resistant alloy comprising nickel, one or more rare earth elements, tin and aluminum; and the cocatalyst is a soluble tungstic acid salt and/or an insoluble tungsten compound.

2. The method of claim 1 , wherein the diol is ethylene glycol.

3. The method of claim 2 , wherein the pH of the reactor is 1-7.

4. The method of claim 1 , wherein the sugar is selected from the group consisting of one or more five-carbon monosaccharides, disaccharides, and oligosaccharides; six-carbon monosaccharides, disaccharides and oligosaccharides; soluble five-carbon polysaccharides and soluble six-carbon polysaccharides.

5. The method of claim 1 , wherein the sugar is provided in the form of an aqueous sugar solution, wherein the aqueous sugar solution has a concentration of 5-60 wt %.

6. The method of claim 5 , wherein the amount of the soluble cocatalyst used is 0.01-5 wt % of the aqueous sugar solution.

7. The method of claim 6 , wherein the amount of the insoluble cocatalyst used is 0.5-50 wt % of the main catalyst.

8. The method for preparing a diol as claimed in claim 1 , characterized in that the acid-resistant alloy comprises, in parts by weight, 10-90 parts nickel, 1-5 parts rare earth element, 1-60 parts tin and 5-9 parts aluminum.

9. The method of claim 1 , wherein the acid-resistant alloy comprises, in parts by weight, 10-90 parts nickel, 1-5 parts rare earth element, 1-60 parts tin, 5-9 parts aluminum, 1-90 parts tungsten and 0.5-20 parts molybdenum.

10. The method of claim 1 , wherein the soluble tungstic acid salt is selected from the group consisting of ammonium tungstate, sodium tungstate, sodium phosphotungstate and combinations thereof.

11. The method of claim 1 , wherein the insoluble tungsten compound is selected from tungsten trioxide, tungstic acid and a combination thereof.

12. The method of claim 1 , wherein the amount of the main catalyst used is 0.01-10 times the amount of sugar fed per hour.

13. The method of claim 1 , wherein the reactor has a reaction pressure of 6-10 MPa, a reaction temperature of 180-250° C., and a reaction time of 0.5-3 h.

14. The method of claim 1 , wherein the method is continuous.

15. The method of claim 14 , wherein the amount of main catalyst added is: 0.01-5 kg of main catalyst is added per 1000 kg of sugar fed.

16. The method of claim 1 , further comprising separating the cocatalyst from the diol and then recycling the cocatylst in a subsequent method.

17. The method of claim 1 , wherein the reactor is slurry bed reactor.

Assignees

• Changchun Meihe Science And Tech Development Co Ltd
• Coca Cola Co
• Changchum Meihe Science And Tech Development Co Ltd

Inventors

• Liu Jing
• Qi Hongbin
• Ren Haiyu
• Prakash Indra
• Shi Yu

Classifications

• C07C31/20

  Dihydroxylic alcohols · CPC title

• B01J23/888 Primary

  Tungsten · CPC title

• C07C29/60

  by elimination of -OH groups, e.g. by dehydration (C07C29/34 takes precedence) · CPC title

• C07C29/132 Primary

  by reduction of an oxygen containing functional group · CPC title

• B01J37/04

  Mixing {(B01J37/0009, B01J37/0018 take precedence)} · CPC title