DE1443752A1 - Process for the production of alkali salts of acrylic or methacrylic acid - Google Patents

Description

814

Troisdorf, November 27, 1964

H43752

CYIiMIf HOBEL AKTIEIOBSJALLSCHA !? froisdorf owner Cologne

Process · »* ur production τοη alkali salts of acrylic or Methacrylic acid Addition to patent application JO 44 125 IYb / 12 ο Subject of the main patent (S 44 125 ITb / 12 o)

is a process for the production of τοη alkali metal salts from carboxylic acids duroh oxidation of the corresponding alcohols, which is characterized in that one is used as the oxidizing agent in alkaline aqueous medium copper (II) oxide or copper (II) hydroxide each in the presence of τοη precious metals and / or their Oxides or hydroxides are used. Do this procedure s.B. Torteilhaft made alkali salts of acrylic or methacrylic acid will.

Duroh high-temperature carbonization τοη propylene and isobutylene are allyl chloride and methallyl chloride particularly easily accessible, but they can only be converted into the associated alcohols with difficulty. As allyl chloride is converted in an alkaline solution only at 15O ⁰ C autoclave is in allyl alcohol, which must then be eliminated from the mixture of substances. Methallyl chloride can only be obtained by boiling it for 20-30 hours with potassium carbonate.

ο nat or duroh heating with matron lye or soda solution

120 C under pressure can be converted into methallyl alcohol, the

^ then deetillatiT must be cleaned.

co Surprisingly, it has now been found that allyl chloride cn

and methallyl chloride after an oxidation process according to

Main patent directly into the alkali salts of the associated a ^ ß.-un-

1U3752

let convert saturated acids. This eliminates the difficult production of the corresponding alcohols and . For example, the multi-level path succeeds

CH ₂ - CH - CH ₂ Cl - ^ CH ₂ - CK - CHgOH - * JH ₂ - CH - QOOH

practically to be shortened to one level. You can work under normal pressure or under excess pressure. The one to use The amount of alkali increases naturally to about double compared to the process according to the main patent, and it is expedient to work at the highest possible concentration.

Example 1t

7.65 g of allyl chloride and 200 ml of n-NaOH were refluxed with stirring for 15 hours together with a freshly precipitated mixture of 48 g of Cu (OH) ₂ and 1.4 g of AgOH, then the sediment was separated off. The allyl chloride conversion was 61/4, and the yield of aoryl acid sodium (based on converted allyl chloride) was 85.5 μl of theory.

Example 2t

9 g of methallyl chloride and 200 ml of n-KOH were erated together with a previously prepared mixture of 48 g of CuO and 1.4 g of Ag ₂ O for 15 hours with stirring and reflux, and the solid was then filtered off with suction. The methallyl chloride conversion was 73%, the yield of methacrylic acid potassium (based on converted methallyl chloride) 89-5% of theory.

i » Example 3t

^ j 48 g CuO, 1.4 g Ag-O were in 100 ml 20.2 ^ iger sodium hydroxide solution

- together with 7.65 g of allyl chloride for 4 hours under reflux

^<£> hitsen stirred, the solid was then sucked off. The AlIyI-

chloride conversion was $ 83.5 1 the yield of sodium aorylate

- 3 - BAD LOCAL SALE

U43752

99 i · theory (based on converted allyl chloride).

Example 4t

48 g CuO, 1.4 g Ag ₂ O were stirred in 100 al 25, ο ^ lger potassium hydroxide solution * u-IUMB Bit 9 g methallyl chloride for 4 hours under reflux, the solid was then sucked off. The Hcthallylohlorid-Ümeatz was 81.1 i> _t dl · yield of "ethaoryisaurem potassium practically quantitatir was (referring to vice • etstes Methallylohlorid).

9 0 9 8 2 7 / U 9 B BAD ORIGINAL

Claims (1)

1U3752 Godmother t anipruoh ι Preparation method sur τοη Alkaliealsen of acrylic or methacrylic NaOH ·· ·· Oxydationaverfshren geaäß main patent. ·. ·. · · .. .. .. ·, characterized gelcenn.se 1 without t _(this is
ans parts of allyl bsw. Methallyl alcohol allyl chloride or methallyl chloride elnietst. BATH ORIGINAL 9 0 9? :> ■ - / 1 U 9 (5