# US 10,478,798 B2 · Methanol synthesis process layout for large production capacity

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- Number: US 10,478,798 B2
- Document ID: US10478798B2
- Status: Granted
- Kind: B2
- Application number: 16/083,549
- Filed: 2017-03-23
- Published: 2019-05-02
- Granted: 2019-11-19
- Earliest claimed: 2016-03-30
- Assignees: Haldor Topsoe A/S
- Applicants: Haldor Topsøe A/S
- Inventors: Hassan Modarresi
- Web page: https://patentgrep.com/patent/US10478798B2

## CPC

- B01J 19/242: {in series}
- B01J 8/0257: {in a cylindrical annular shaped bed}
- B01J 8/0278: {Feeding reactive fluids (for solid material B01J8/0015)}
- B01J 8/06: in tube reactors; the solid particles being arranged in tubes
- C07C 29/152: characterised by the reactor used
- B01J 2208/00176: outside the reactor
- B01J 2208/00274: involving reactant vapours
- B01J 2208/0053: Controlling multiple zones along the direction of flow, e.g. pre-heating and after-cooling
- B01J 2219/00006: Large-scale industrial plants
- B01J 2219/00018: Construction aspects
- B01J 2219/00051: Controlling the temperature
- B01J: CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- C07C: ACYCLIC OR CARBOCYCLIC COMPOUNDS

## Abstract

A process layout for large scale methanol synthesis comprises one or more boiling water reactors and one or more radial flow reactors in series, the boiling water reactor(s) being fed with approximately fresh make-up syngas. The methanol synthesis loop comprises a make-up gas compressor K1, a recycle gas compressor K2, two or more boiling water converters for methanol synthesis (A1, A2, . . . ), a radial flow converter (B) for methanol synthesis, a steam drum (V1), a high pressure separator (V2), a low pressure separator (V3), feed effluent heat exchangers (E1 and E2), a wash column (C), an air cooler (E3) and a water cooler (E4).

## Claims

### Claim 1

A process layout for a methanol synthesis loop comprising;
a first gas compressor for pressurizing a make-up gas,
two or more boiling water converters for receiving the pressurized make-up gas and outputting a product gas,
a first heat exchanger for cooling the product gas and pre-heating the make-up gas,
a high pressure separator for separating the cooled product gas into a liquid stream and a gas stream,
a second gas compressor for compressing the gas stream,
a second heat exchanger for pre-heating the compressed gas stream,
a radial flow reactor for receiving pre-heated compressed gas stream and outputting an effluent product gas, the effluent product gas being partly cooled in the second heat exchanger and added, in part, to the product gas from the boiling water converters, wherein a second part of the effluent product gas is drawn as a purge gas,
a wash column for washing the purge gas with water to remove methanol, resulting in a methanol-free gas and a washed product, and
a low pressure separator for receiving the washed product and the cooled liquid stream from the high pressure separator, separating out gases, and outputting a crude methanol product.

### Claim 2 (depends on 1)

A process layout for a methanol synthesis loop according to claim 1, wherein the purge gas is split from the effluent product gas as wet gas (including methanol) and washed with water in the wash column to recover methanol at approximately the synthesis loop pressure.

### Claim 3 (depends on 1)

A process layout for a methanol synthesis loop according to claim 1, wherein the radial flow reactor temperature is controlled by adjusting the purge gas and hence the level of inert gas in the reactor inlet.

### Claim 4 (depends on 1)

A process layout for a methanol synthesis loop according to claim 1, wherein the radial flow reactor has a structure which requires no cooling device.

### Claim 5 (depends on 1)

A process layout for a methanol synthesis loop according to claim 1, wherein only one train of cooling equipment is used.