Methanol plant and gasoline synthesis plant

Patent metadata

Field	Value
Publication number	US-9790154-B2
Application number	US-201414769190-A
Country	US
Kind code	B2
Filing date	Feb 26, 2014
Priority date	Mar 11, 2013
Publication date	Oct 17, 2017
Grant date	Oct 17, 2017

Abstract

Provided is a methanol plant that can obtain fresh water from sea water by using, in a seawater desalination device, the exhaust heat discharged in a step for producing methanol from natural gas. The methanol plant is provided with: a heat exchanger ( 4 ) that recovers into a thermal medium (for example, seawater) the exhaust heat discharged from a step for producing methanol from a feed stock (for example, natural gas); and a seawater desalinization device ( 6 ) that obtains freshwater from seawater using the exhaust heat recovered by means of the thermal medium.

First claim

The invention claimed is:

1. A methanol plant comprising:
a heat exchanger which makes exhaust heat that is discharged from a process of producing methanol from a feed stock be recovered to seawater; and
a seawater desalination device which obtains fresh water from the seawater by using the exhaust heat recovered from the seawater by the heat exchanger,
wherein a plurality of the heat exchangers is provided in a distillation process of the process of producing methanol in a flow direction of mixed gas after methanol synthesis,
wherein the mixed gas passes through the plurality of heat exchangers, and a temperature of the mixed gas decreases, and a wetness of the mixed gas increases as it flows toward a downstream side in the flow direction of the mixed gas, and
wherein heat exchange with the mixed gas having increased wetness is performed in the heat exchanger provided on a downstream side in the flow direction of the mixed gas.

2. The methanol plant according to claim 1 , wherein the exhaust heat has a temperature in a range of 100° C. to 200° C.

3. The methanol plant according to claim 2 , wherein the seawater desalination device obtains the fresh water by a multistage flash evaporation method using the exhaust heat.

4. The methanol plant according to claim 2 , wherein the methanol is produced by using vapor which is produced from the fresh water.

5. The methanol plant according to claim 2 , wherein the process is provided with a step of producing gasoline from the methanol.

6. The methanol plant according to claim 1 , wherein the seawater desalination device obtains the fresh water by a multistage flash evaporation method using the exhaust heat.

7. The methanol plant according to claim 6 , wherein the methanol is produced by using vapor which is produced from the fresh water.

8. The methanol plant according to claim 6 , wherein the process is provided with a step of producing gasoline from the methanol.

9. The methanol plant according to claim 1 , wherein the methanol is produced by using vapor which is produced from the fresh water.

10. The methanol plant according to claim 9 , wherein the process is provided with a step of producing gasoline from the methanol.

11. The methanol plant according to claim 1 , wherein the process is provided with a step of producing gasoline from the methanol.

12. A gasoline synthesis plant comprising:
a methanol plant which produces methanol from a feed stock;
a heat exchanger which makes exhaust heat that is discharged from a process of producing gasoline from the methanol be recovered to seawater; and
a seawater desalination device which obtains fresh water from the seawater by using the exhaust heat recovered by the seawater.

Assignees

• Mitsubishi Heavy Ind Ltd

Inventors

• Iijima Masaki
• Hirayama Haruaki

Classifications

• Y02P70/34

  Cross-Sectional Technologies · mapped topic

• B01D3/007

  Energy recuperation; Heat pumps · CPC title

• C02F1/16

  using waste heat from other processes · CPC title

• B01D3/146

  Multiple effect distillation · CPC title

• Y02P20/124

  Cross-Sectional Technologies · mapped topic