# US 11,028,106 B2 · Method for producing tetraalkoxysilane

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- Number: US 11,028,106 B2
- Document ID: US11028106B2
- Status: Granted
- Kind: B2
- Application number: 16/955,271
- Filed: 2018-12-25
- Published: 2020-11-05
- Granted: 2021-06-08
- Earliest claimed: 2017-12-27
- Assignees: National Institute of Advanced Industrial Science and Technology
- Applicants: National Institute of Advanced Industrial Science and Technology
- Inventors: Norihisa Fukaya; Seong-Jib Choi; Jun-Chul Choi; Toshio Horikoshi; Sho Kataoka; Thuy Nguyen; Kazuhiko Sato; Minoru Hasegawa; Hiroshi Kumai
- Web page: https://patentgrep.com/patent/US11028106B2

## CPC

- C07F 7/04: Esters of silicic acids
- B01J 8/082: {Controlling processes}
- B01J 2208/00017: Controlling the temperature
- C07F: ACYCLIC, CARBOCYCLIC OR HETEROCYCLIC COMPOUNDS CONTAINING ELEMENTS OTHER THAN CARBON, HYDROGEN, HALOGEN, OXYGEN, NITROGEN, SULFUR, SELENIUM OR TELLURIUM (metal-containing porphyrins C07D487/22)
- B01J: CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS

## Abstract

An object of the present invention is to provide a method capable of producing a tetraalkoxysilane with a high energy efficiency and with a high yield. The present invention provides a method for producing a tetraalkoxysilane, the method including: a first step of reacting an alcohol with a silicon oxide; and a second step of bringing a vaporized component of the reaction mixture obtained in the first step into contact with a molecular sieve.

## Claims

### Claim 1

A method for producing a tetraalkoxysilane, the method comprising:
a first step of reacting an alcohol with a silicon oxide; and
a second step of bringing a vaporized component of the reaction mixture obtained in the first step into contact with a molecular sieve;
wherein:
the first step is carried out in a reactor whose temperature (T1) is controlled within the range of 200° C.<T1<300° C.;
the second step is carried out in a container whose temperature (T3) is controlled within the range of 10° C.≤T3≤150° C., and which includes the molecular sieve provided therein;
the vaporized component moves from the reactor to the container through an outward flow path whose temperature (T2) is controlled within the range of 190° C.≤T2≤300° C.; and
a component which has been brought into contact with the molecular sieve in the second step moves from the container to the reactor through an inward flow path.

### Claim 2 (depends on 1)

The method for producing a tetraalkoxysilane according to claim 1, wherein the first step is carried out in the presence of an alkali metal compound and/or an alkaline earth metal compound.

### Claim 3 (depends on 2)

The method for producing a tetraalkoxysilane according to claim 2, wherein the alkali metal compound is at least one selected from the group consisting of an alkali metal hydroxide, an alkali metal halide, an alkali metal carbonate and an alkali metal bicarbonate.

### Claim 4 (depends on 1)

The method for producing a tetraalkoxysilane according to claim 1, wherein the reaction mixture does not comprise a compound for carrying out an azeotropic distillation.

### Claim 5 (depends on 3)

The method for producing a tetraalkoxysilane according to claim 3, wherein the alkali metal compound is at least one selected from the group consisting of lithium hydroxide, sodium hydroxide, potassium hydroxide, calcium hydroxide, cesium hydroxide, lithium carbonate, sodium carbonate, potassium carbonate, cesium carbonate, sodium fluoride, potassium fluoride and cesium fluoride.

### Claim 6 (depends on 1)

The method for producing a tetraalkoxysilane according to claim 1, wherein the temperature (T2) is controlled within the range of 210° C.≤T2≤300° C., and the temperature (T2) is higher than the temperature (T1).

### Claim 7 (depends on 1)

The method for producing a tetraalkoxysilane according to claim 1, wherein the molecular sieve is 3A zeolite or 4A zeolite.

### Claim 8 (depends on 1)

The method for producing a tetraalkoxysilane according to claim 1, wherein the alcohol is an alcohol having 1 to 10 carbon atoms.

### Claim 9 (depends on 2)

The method for producing a tetraalkoxysilane according to claim 2, wherein the reaction mixture does not comprise a compound for carrying out an azeotropic distillation.

### Claim 10 (depends on 2)

The method for producing a tetraalkoxysilane according to claim 2, wherein the temperature (T2) is controlled within the range of 210° C.≤T2≤300° C., and the temperature (T2) is higher than the temperature (T1).

### Claim 11 (depends on 2)

The method for producing a tetraalkoxysilane according to claim 2, wherein the molecular sieve is 3A zeolite or 4A zeolite.

### Claim 12 (depends on 2)

The method for producing a tetraalkoxysilane according to claim 2, wherein the alcohol is an alcohol having 1 to 10 carbon atoms.

### Claim 13 (depends on 3)

The method for producing a tetraalkoxysilane according to claim 3, wherein the reaction mixture does not comprise a compound for carrying out an azeotropic distillation.

### Claim 14 (depends on 3)

The method for producing a tetraalkoxysilane according to claim 3, wherein the temperature (T2) is controlled within the range of 210° C.≤T2≤300° C., and the temperature (T2) is higher than the temperature (T1).

### Claim 15 (depends on 3)

The method for producing a tetraalkoxysilane according to claim 3, wherein the molecular sieve is 3A zeolite or 4A zeolite.

### Claim 16 (depends on 3)

The method for producing a tetraalkoxysilane according to claim 3, wherein the alcohol is an alcohol having 1 to 10 carbon atoms.

### Claim 17 (depends on 4)

The method for producing a tetraalkoxysilane according to claim 4, wherein the temperature (T2) is controlled within the range of 210° C.≤T2≤300° C., and the temperature (T2) is higher than the temperature (T1).

### Claim 18 (depends on 4)

The method for producing a tetraalkoxysilane according to claim 4, wherein the molecular sieve is 3A zeolite or 4A zeolite.

### Claim 19 (depends on 4)

The method for producing a tetraalkoxysilane according to claim 4, wherein the alcohol is an alcohol having 1 to 10 carbon atoms.