PRODUCTION METHOD OF EPSILON-CAPROLACTAM

• US 20190241513A1
• Filed: 09/07/2017
• Published: 08/08/2019
• Est. Priority Date: 09/14/2016
• Status: Active Grant

• Current Assignee: Sumitomo Chemical Company Limited
• Original Assignee: Sumitomo Chemical Company Limited
• Inventors: YOSHIMURA, Kazuaki, WATANABE, Nobufumi, SEKI, Kohei, TERAMORI, Masashi, TANAKA, Keisuke
• Granted Patent: US 10,457,636 B2
• Time in Patent Office: Days
• CPC Class Codes: B01J 29/40 of the pentasil type, e.g. types ZSM-5, ZSM-8 or ZSM-11, as exemplified by patent documents US3702886, GB1334243 and US3709979, respectively
• CPC Class Codes: C01B 39/36 Pentasil type, e.g. types ZSM-5, ZSM-8 or ZSM-11
• CPC Class Codes: C07D 201/04 from or via oximes by Beckmann rearrangement
• CPC Class Codes: C07D 211/76 attached in position 2 or 6
• CPC Class Codes: C07D 233/10 with only hydrogen atoms or radicals containing only hydrogen and carbon atoms, directly attached to ring nitrogen atoms
• CPC Class Codes: Y02P 20/52 using catalysts, e.g. selective catalysts

Abstract

A method for producing ε-caprolactam involves a step of Beckmann-rearranging cyclohexanone oxime in a gas phase in the presence of a zeolite catalyst containing silicon and at least one element selected from alkaline earth metal elements and magnesium. The concentration of the above-described element in the zeolite catalyst is 3 ppm by mass or more and 10000 ppm by mass or less.

Claims

1. A production method of ε

-caprolactam, comprising a step of Beckmann-rearranging cyclohexanone oxime in a gas phase in the presence of a zeolite catalyst containing a silicon element and at least one element selected from the group consisting of alkaline earth metal elements and a magnesium element, wherein the concentration of the at least one element selected from the group consisting of alkaline earth metal elements and a magnesium element in the zeolite catalyst is 3 ppm by mass or more and 10000 ppm by mass or less.

2. The production method of ε

-caprolactam according to claim 1, further comprising a step of producing the zeolite catalyst by a method containing the following mixing step;

Mixing step;

a step of mixing zeolite with a solution containing a compound having at least one element selected from the group consisting of alkaline earth metal elements and a magnesium element.

3. The production method of ε

-caprolactam according to claim 2, wherein said zeolite has a pentasil type structure.

4. The production method of ε

-caprolactam according to claim 2, wherein said zeolite is zeolite having nest silanol, and said zeolite having nest silanol is produced by a method containing the following step (1) and the following step in this order;

Step (1);

a step of reacting a mixture containing a silicon compound and at least one compound selected from the group consisting of boron compounds and germanium compounds, to obtain a zeolite crystal;

Step (2);

a step of contact-treating the zeolite crystal with an aqueous solution containing at least one acid selected from the group consisting of inorganic acids and organic acids.

5. The production method of ε

-caprolactam according to claim 1, wherein said zeolite catalyst contains a magnesium element.