A catalyst for dehydration reaction of hydroxypropionic acid and a method for preparing the same

Patent metadata

Field	Value
Publication number	US-2026034538-A1
Application number	US-202418997466-A
Country	US
Kind code	A1
Filing date	Jun 7, 2024
Priority date	Jun 23, 2023
Publication date	Feb 5, 2026
Grant date	—

Abstract

A catalyst for dehydration reaction of hydroxypropionic acid and derivatives thereof, and a preparation method thereof. The catalyst includes a molded body in which primary particles of hydroxyapatite are aggregated, wherein a volume average particle size of the primary particles is 15 μm to 150 μm, and a P value represented by the following Equation 1 is 3.5 to 19:

P
=

A
*

B
/
C

[

Equation
⁢

1

]

wherein in Equation 1. A represents the volume average particle size (μm) value of powder, B represents a crush strength (N) value, and C represents a specific surface area (m 2 /g) value. The catalyst has very excellent life characteristics while exhibiting a high reaction yield and selectivity.

First claim

1 . A catalyst for dehydration reaction of hydroxypropionic acid and derivatives thereof, the catalyst comprising a molded body in which primary particles of hydroxyapatite are aggregated, wherein a volume average particle size of the primary particles is 15 μm to 150 μm, and a P value represented by the following Equation 1 is 3.5 to 19:

P
=

A
*

B
/
C

[

Equation
⁢

1

]

wherein in Equation 1, A represents the volume average particle size (μm) value of powder, B represents a crush strength (N) value, and C represents a specific surface area (m 2 /g) value.

2 . The catalyst of claim 1 , wherein the volume average particle size of the primary particles is 25 μm to 100 μm.

3 . The catalyst of claim 1 , further comprising an alkali metal, wherein an amount of the alkali metal is 3% by weight to 8% by weight.

4 . The catalyst of claim 3 , wherein the alkali metal is sodium or potassium.

5 . The catalyst of claim 1 , wherein a tap density value is 0.8 g/cm 3 to 1.0 g/cm 3 .

6 . The catalyst of claim 1 , wherein a crush strength value is 6 N to 20 N.

7 . The catalyst of claim 1 , wherein a specific surface area value is 50 m 2 /g to 90 m 2 /g.

8 . A method of preparing a catalyst for dehydration reaction of hydroxypropionic acid and derivatives thereof, the method comprising the steps of:
preparing a slurry by introducing 1 part by weight to 50 parts by weight of a binder with respect to 100 parts by weight of hydroxyapatite; producing a molded body by molding the slurry; and drying the molded body.

9 . The method of claim 8 , wherein the binder includes 0.1 part by weight to 10 parts by weight of isopropyl alcohol with respect to 100 parts by weight of hydroxyapatite.

10 . A method of preparing acrylic acid, the method comprising the step of performing a dehydration reaction of hydroxycarboxylic acid or derivatives thereof in the presence of the catalyst of claim 1 .

Assignees

• Lg Chemical Ltd

Inventors

• Han Jun Kyu
• Huang Rui
• Lee Haeryeong
• Kwon Heon Yong
• Bang Jungup
• Byun Wonbae
• Kim Dongeun
• Choi Jae Soon
• Kim Mahnjung
• Kim Jaeyoung

Classifications

• C07C57/04

  Acrylic acid; Methacrylic acid · CPC title

• C07C55/00

  Saturated compounds having more than one carboxyl group bound to acyclic carbon atoms · CPC title

• C07C51/377

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

• B01J37/0009

  Use of binding agents; Moulding; Pressing; Powdering; Granulating; Addition of materials ameliorating the mechanical properties of the product catalyst · CPC title

• B01J27/1806 Primary

  with alkaline or alkaline earth metals · CPC title