Claims
- 1. In a process for producing hydrocarbons which boil in the gasoline and diesel fuel ranges from coal, wherein a first portion of coal is reduced to a particle size below 2 mm, mixed with oil to form a pumpable pulp, the pumpable pulp is contacted with hydrogen in a hydrogenating zone under a pressure of 100-400 bars at a temperature of 300.degree.-500.degree. C., the resultant hydrotreated product separated into fractions including a liquid fraction comprising mainly hydrocarbons of 4 to 30 carbon atoms per molecule and a high melting residue fraction containing pitch and solids,
- A. a second portion of coal having a particular size of 3 to 50 mm is fed to a gasifying vessel and is gasified in a fixed bed under pressure of 10 to 100 bars by contacting the composition with at least one gasifying agent selected from the group consisting of water vapor, oxygen, and carbon dioxide, said gasifying agent passing in countercurrent flow to the direction of movement of said second portion of coal,
- B. withdrawing gasification product gas comprising hydrogen and carbon monoxide from said vessel and cooling the same and withdrawing therefrom tar and oil as condensate, the gasification product gas is fed after purification to a Fischer-Tropsch synthesis section for production of primary product hydrocarbons which at least in part contain 4 to 30 carbon atoms per molecule, said primary product hydrocarbons being at least partially converted to motor fuel,
- the improvement which comprises withdrawing said high melting residue fraction, granulating said residue fraction to a particle size of 3 to 50 mm and feeding it into said gasifying vessel for gasification together with said second portion of coal.
- 2. A process according to claim 1 wherein following step B the product gas which has been freed of tar and oil is further purified.
- 3. A process according to claim 1 wherein the tar and oil removed are used at least in part to form said pumpable pulp.
- 4. A process according to claim 1 wherein the liquid fraction comprising hydrocarbons of 4 to 30 carbon atoms per molecule is thereafter treated with hydrogen in the presence of a catalyst to convert the same to a motor fuel component.
- 5. A process according to claim 1 wherein the tar products from said hydrogenating zone are admixed with oil and tar condensate obtained as a result of cooling said gasification product and the resulting composition is subjected to cracking.
- 6. A process according to claim 1 wherein the residual gases from the hydrogenating section and/or the Fischer-Tropsche synthesis section are withdrawn and converted to high hydrogen gas and the hydrogen is separated and fed to the hydrogenating section.
- 7. A process according to claim 1 wherein the pressure maintained within the gasifying vessel is 15-50 bars.
- 8. A process according to claim 1 wherein the conditions within the gasifying vessel are maintained such that the gasification product gas withdrawn from the gasifying vessel is at a temperature, prior to the cooling of step B, of 300.degree.-800.degree. C.
Priority Claims (1)
Number |
Date |
Country |
Kind |
2735829 |
Aug 1977 |
DEX |
|
Parent Case Info
This is a continuation of application Ser. No. 931,349 filed Aug. 7, 1978, now abandoned.
US Referenced Citations (9)
Non-Patent Literature Citations (1)
Entry |
British Chemical Engineering, (1) May 1957, pp. 238-244, (2) Jun. 1957, pp. 308-312, (3) Jul. 1957, pp. 368-373 and pp. 418-419 in Aug. 1957, Hoogendoorn et al. |
Continuations (1)
|
Number |
Date |
Country |
Parent |
931349 |
Aug 1978 |
|