Method for producing catalyst for dehydrogenation of 3-hydroxypropionic acid, catalyst for dehydrogenation of 3-hydroxypropionic acid, and method for producing acrylic acid using same

Patent metadata

Field	Value
Publication number	US-2023159427-A1
Application number	US-202117915054-A
Country	US
Kind code	A1
Filing date	Oct 14, 2021
Priority date	Nov 27, 2020
Publication date	May 25, 2023
Grant date	—

Abstract

A method for preparing a catalyst for a dehydration reaction of 3-hydroxypropionic acid, the catalyst for dehydration reaction of 3-hydroxypropionic acid, and a method for producing acrylic acid using the same.

First claim

1 . A method for preparing a catalyst for a dehydration reaction of 3-hydroxypropionic acid, the catalyst including hydroxyapatite (HAP) and calcium pyrophosphate, the method comprising the steps of:
dropping a first phosphate solution into a first calcium salt solution to produce an apatite cake; dropping a second phosphate solution into a second calcium salt solution to produce a calcium pyrophosphate (CaPP) cake; mixing the apatite cake and the calcium pyrophosphate cake to produce a calcium phosphate cake; and firing the calcium phosphate cake.

2 . The method of claim 1 , wherein a weight ratio of the apatite cake and the calcium pyrophosphate cake in the step of mixing the apatite cake and the calcium pyrophosphate cake is 10:90 to 80:20.

3 . The method of claim 1 , wherein a calcium salt concentration of each of the first calcium salt solution and the second calcium salt solution is 0.1 M or more and 5 M or less.

4 . The method of claim 1 , wherein a phosphate concentration of each of the first phosphate solution and the second phosphate solution 0.1 M or more and 5 M or less.

5 . The method of claim 1 , wherein the step of dropping the first phosphate solution into the first calcium salt solution comprises a step of dropping the first phosphate solution into a bath containing the first calcium salt solution, and the step of dropping the second phosphate solution into the second calcium salt solution comprises a step of dropping the second phosphate solution into a bath containing the second calcium salt solution.

6 . The method of claim 1 , wherein the each of the step of dropping the first phosphate solution into the first calcium salt solution and the step of dropping the second phosphate solution into the second calcium salt solution is are each performed for 30 seconds or more and 1 hour or less.

7 . The method of claim 1 , wherein the first phosphate solution comprises one or more selected from the group consisting of Li 3 PO 4 , Na 3 PO 4 , K 3 PO 4 , and hydrates thereof.

8 . The method of claim 1 , wherein the second phosphate solution comprises one or more selected from the group consisting of pyrophosphoric acid (H 4 P 2 O 7 ), Li 4 P 2 O 7 , Na 4 P 2 O 7 , and K 4 P 2 O 7 , and hydrates thereof.

9 . The method of claim 1 , wherein each of the first calcium salt solution and the second calcium salt solution comprises one or more calcium salts selected from the group consisting of calcium chloride, calcium nitrate, calcium sulfate, calcium acetate, and hydrates thereof.

10 . The method of claim 1 , wherein the step of mixing the apatite cake and the calcium pyrophosphate cake comprises the steps of: preparing a calcium phosphate slurry by mixing the apatite cake and the calcium pyrophosphate cake; and filtering, washing, and drying the calcium phosphate slurry to prepare a calcium phosphate cake.

11 . The method of claim 10 , wherein the step of preparing the calcium phosphate slurry comprises a step of stirring a mixture of the apatite cake and the calcium pyrophosphate cake at a temperature of 20° C. to 60° C. for 1 hour to 48 hours.

12 . The method of claim 1 , wherein the firing is performed at a temperature of 300° C. to 700° C.

13 . A catalyst for dehydration reaction of 3-hydroxypropionic acid, the catalyst including a hydroxyapatite phase and a calcium pyrophosphate phase, wherein a weight ratio of the hydroxyapatite phase and the calcium pyrophosphate phase is 10:90 to 80:20.

15 . A method for producing acrylic acid, the method comprising a step of dehydrating 3-hydroxypropionic acid in the presence of the catalyst according to claim 13 .

15 . The method of claim 14 , wherein the step of dehydrating 3-hydroxypropionic acid is carried out at a temperature of 70° C. to 400° C.

Assignees

• Lg Chemical Ltd

Inventors

• Kim Jaeyoung
• Bang Jungup
• Choi Jae Soon

Classifications

• B01J37/04 Primary

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

• B01J27/1806

  with alkaline or alkaline earth metals · CPC title

• B01J37/08

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

• C07C57/04

  Acrylic acid; Methacrylic acid · CPC title

• C07C51/377 Primary

  by splitting-off hydrogen or functional groups; by hydrogenolysis of functional groups {(C07C51/36 - C07C51/373 take precedence)} · CPC title