Method of making acrylic acid from hydroxypropionic acid

Patent metadata

Field	Value
Publication number	US-10487035-B2
Application number	US-201815861704-A
Country	US
Kind code	B2
Filing date	Jan 4, 2018
Priority date	Nov 3, 2016
Publication date	Nov 26, 2019
Grant date	Nov 26, 2019

Abstract

Methods for making acrylic acid, acrylic acid derivatives, or mixtures thereof by contacting a stream containing hydroxypropionic acid, hydroxypropionic acid derivatives, or mixtures thereof with either an active catalyst containing an amorphous and partially-dehydrated phosphate salt or a precursor catalyst containing a crystalline phosphate salt in a reactor with a low corrosion rate are provided.

First claim

What is claimed is:

1. A method of making acrylic acid, acrylic acid derivatives, or mixtures thereof comprising contacting a gas feed stream comprising water vapor and hydroxypropionic acid, hydroxypropionic acid derivatives, or mixtures thereof with an active catalyst in a single-layer reactor at a temperature, a water partial pressure, a GHSV, and a WHSV to dehydrate said hydroxypropionic acid, hydroxypropionic acid derivatives, or mixtures thereof, resulting in the production of acrylic acid, acrylic acid derivatives, or mixtures thereof; wherein said active catalyst comprises a phosphate salt comprising a cation and an anion represented by the empirical formula:
[H 2(1-x) PO (4-x) ] −
wherein x is any real number greater than 0 and less than 1; wherein said water partial pressure is equal to or greater than about 0.4 bar; wherein said single-layer reactor comprises a wall, an outer surface, and an inner surface; wherein said wall is made from a wall material, has a wall thickness, and extends from said outer surface to said inner surface; wherein said wall material comprises silicon in an amount between about 1 wt % and about 50 wt %; wherein said inner surface is in contact with said active catalyst; and wherein said single-layer reactor has a corrosion rate lower than about 1.3 mm/y during said dehydration.

2. The method of claim 1 ; wherein said wall material further comprises nickel in an amount between about 10 wt % and about 65 wt %, chromium in an amount between about 15 wt % and about 30 wt %, and iron in an amount between about 2 wt % and about 65 wt %.

3. The method of claim 1 ; wherein said inner surface is subjected to oxidation and forms an oxide-based surface passivating layer comprising silica.

Assignees

• Procter & Gamble

Inventors

• Collias Dimitris Ioannis
• Godlewski Jane Ellen
• Velasquez Juan Esteban

Classifications

• C07C59/08

  Lactic 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

• C07C51/04

  from carboxylic acid halides · CPC title

• B01J2219/0245

  of synthetic organic material · CPC title

• A61B18/18

  by applying electromagnetic radiation, e.g. microwaves · CPC title