Production of acrylates by catalytic dehydration of lactic acid and alkyl lactates

• US 2,859,240 A
• Filed: 01/12/1956
• Issued: 11/04/1958
• Est. Priority Date: 01/12/1956
• Status: Expired due to Term

• Current Assignee: Holmen, Reynold E.
• Original Assignee: Holmen, Reynold E.
• Inventors: Holmen, Reynold E.
• Application Number:
  US03/558,607
• Time in Patent Office: 1,027 Days
• US Class Current: 560/212
• CPC Class Codes: C07C 51/377 by splitting-off hydrogen or functional groups; by hydrogenolysis of functional groups C07C51/36 - C07C51/373 take precedence
• CPC Class Codes: C07C 57/04 Acrylic acid; Methacrylic acid
• CPC Class Codes: C07C 67/327 by elimination of functional groups containing oxygen only in singly bound form
• CPC Class Codes: C07C 69/54 Acrylic acid esters; Methacrylic acid esters

Claims

1. THE PROCESS OF CATALYTICALLY PRODUCING ACRYLATE MATERIAL FROM LACTATE MATERIAL WHICH COMPRISES THE STEPS OF (1) BRINGING VOLATILE LACTATE STARTING MATERIAL, HAVING THE FORMULA CH3CHOHCOOR, WHERE R IS SELECTED FROM THE GROUP CONSISTING OF HYDROGEN, NH4 AND ALKYL CONTAINING 1-4 CARBON ATOMS, INTO CONTACT WITH A DEHYDRATION CATALYST CONSISTING ESSENTIALLY OF AT LEAST ONE MEMBER OF THE GROUP CONSISTING OF THE SULFATES AND PHOSPHATE OF METALS OF GROUPS I AND II WHICH ARE AT LEAST AS HIGH AS CADMIUM IN THE ELECTROMOTIVE SERIES, AT A TEMPERATURE WITHIN THE RANGE OF 200*C. TO 600*C., AND (2) SEPARATING ACRYLATE MATERIAL FROM AT LEAST SOME OF THE REACTION PRODUCTS.