# US 12,215,091 B2 · Method for producing methylene disulfonate compound

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- Number: US 12,215,091 B2
- Document ID: US12215091B2
- Status: Granted
- Kind: B2
- Application number: 17/798,637
- Filed: 2021-02-08
- Published: 2023-05-18
- Granted: 2025-02-04
- Earliest claimed: 2020-02-14
- Assignees: Sumitomo Seika Chemicals Co., Ltd.
- Applicants: Sumitomo Seika Chemicals Co., Ltd.
- Inventors: Seiya Ashibe; Hirotake Moriyama
- Web page: https://patentgrep.com/patent/US12215091B2

## CPC

- C07D 327/00: Heterocyclic compounds containing rings having oxygen and sulfur atoms as the only ring hetero atoms
- Y02E 60/10: Energy storage using batteries
- C07D: HETEROCYCLIC COMPOUNDS (macromolecular compounds C08)
- Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION

## Abstract

Provided is an industrially advantageous method for producing a methylene disulfonate compound easily and inexpensively using fewer raw materials. The method for producing a methylene disulfonate compound of the present invention comprises step A of reacting at least one alkanesulfonic acid compound and sulfur trioxide in the presence of at least one member selected from the group consisting of a sulfoxide compound and a sulfone compound to thereby obtain reactant A comprising an alkanedisulfonic acid compound, and step B of reacting reactant A obtained in step A and a formaldehyde compound in the presence of sulfur trioxide to thereby obtain a methylene disulfonate compound.

## Claims

### Claim 1

A method for producing a methylene disulfonate compound, comprising:
step A of reacting at least one alkanesulfonic acid compound and sulfur trioxide in the presence of sulfolane to thereby obtain reactant A comprising an alkanedisulfonic acid compound, and
step B of reacting reactant A obtained in step A and a formaldehyde compound in the presence of sulfur trioxide and sulfolane to thereby obtain a methylene disulfonate compound;
the amount of sulfolane in step A being 0.1 mol or more and 10 mol or less per mol of sulfur trioxide,
the amount of sulfur trioxide added in step B being 2.0 mol or more and 10 mol or less per mol of the alkanedisulfonic acid compound;
the alkanesulfonic acid compound being represented by the following formula (1):
wherein in formula (1), R1 and R2 are the same or different, and each is a C1-4 alkyl group optionally substituted with a halogen atom, or a hydrogen atom; and n is an integer of 1 to 4; when n is an integer of 2 to 4, n-number of R1 may be the same or different, and n-number of R2 may be the same or different;
the alkanedisulfonic acid compound being represented by the following formula (4):
wherein in formula (4), R1, R2, and n are respectively the same as R1, R2, and n in formula (1); and
the methylene disulfonate compound being represented by the following formula (5):
wherein in formula (5), R1, R2, and n are respectively the same as R1, R2, and n in formula (1).

### Claim 2 (depends on 1)

The method for producing a methylene disulfonate compound according to claim 1, wherein reactant A obtained in step A is used in step B without isolating the alkanedisulfonic acid compound from reactant A.

### Claim 3 (depends on 1)

The method for producing a methylene disulfonate compound according to claim 1, wherein the reaction of step A and the reaction of step B are performed in the presence of a solvent.

### Claim 4 (depends on 1)

The method for producing a methylene disulfonate compound according to claim 1, wherein the formaldehyde compound is at least one member selected from the group consisting of paraformaldehyde, anhydrous formaldehyde, trioxane, and methylal.