Texaco coal gasification process

The high cost of coal handling and preparation and treatment of effluents, compounded by continuing low prices for cmde oil and natural gas, has precluded significant exploitation of coal as a feedstock for methanol. A small amount of methanol is made from coal in South Africa for local strategic reasons. Tennessee Eastman operates a 195,000-t/yr methanol plant in Tennessee based on the Texaco coal gasification process to make the methyl acetate intermediate for acetic anhydride production (15). 

The model does not refer to any particular coal gasification process. However, in. view of the fact that the coal/water ratio is an essential parameter in the following calculations, it is obvious that in these cases it is the Texaco coal gasification process that was used as a basis. 

Texaco Coal Gasification Process. In the late sixties, the solids gasification process finally evolved to its present form and the energy crisis brought on by the 1973 Arab oil embargo greatly accelerated the development of the Texaco Coal Gasification Process. ... 

Figure 2. Schematic flow diagram of Texaco coal gasification process for hydrogen manufacture...

Richter GN, Schlinger WG. 1980. Environmental assessment of the Texaco coal gasification process. In Cooper HBH Jr, ed. Proc Conf Air Qual Management Electr Power Ind. Vol. 2, 2nd ed. Austin Texas University of Texas at Austin, College of Engineering, 1571-1585. 

The catalyst is not sensitive to sulfur or other oxo poisons, which is another environmental advantage. Together with the simple but effective decantation, which allows the withdrawal of organic and other byproducts at the very moment of separation, accumulation of activity-decreasing poisons in the catalyst solution is prevented. Therefore no special treatment or purification step is necessary. This reduces the environmental burden still further. For a considerable time the oxo units at Ruhrchemie s plant site were even supplied with syngas derived from coal produced by the TCGP (Ruhrchemie/Ruhrkohle s version of the Texaco coal gasification process). In various cases this can be an important factor as far as local resoruces are concerned. 

Table 1.11. Results of gasificaion of Dlinois no. 6 bituminous coal by the TEXACO coal gasification process... 

The sequence of the remainii steps of synthesis gas preparation is CO shift conversion, removal of H2S and CO2 by Rectisol wash (cold methanol), and liquid nitrogen wash. As in other partial oxidation processes, the H2S is converted to elemental sulfur. Ube Industries, Japan, commissioned a 1,500-tpd ammonia plant in 1984 using the Texaco coal gasification process. An energy consumption of 10.9 Gcal/tonne of ammonia is stated this is lower than the normal quoted f ure of 11.6 Gcal/ tonne of NH3 for coal-based processes 131]. Another 1,000 tpd coal-based ammonia plant is scheduled for startup at Wehei, China, in 1996. 

Demonstration of the IGCC concept in the pioneer Cool Water 100-MW project using the Texaco coal gasification process in Southern California during 1984-89. 

Texaco Coal Gasification Process With Direct Quench and Gas... 

As discussed in the Existing Commercial Projects portion of this section, several commercial projects use the Texaco coal gasification process. However, these plants are for chemical synthesis gas application and do not include IGCC power generation. In addition, most commercial Texaco projects do not use syngas coolers to generate steam from the hot raw coal gas. 

T. Sueyama. "Four-Year Operating Experience with Texaco Coal Gasification Process in Ube Ammonia." Presented at the Eighth Aimual EPRI Conference on Coal Gasification, Palo Alto, California, October 1988. 

EPRI Studies. EPRI has sponsored a number of engineering and economic studies Of the Texaco coal gasification process. Economic and technical analyses have been completed for the following applications ... 

Pilot Plant Evaluation of Illinois No. 6 and Pittsburgh No. 8 Coal for the Texaco Coal Gasification Process. Palo Alto, California Electric Power Research Institute, January 1987. AP-5029. 

Fig. 17.20. Flow diagram for the Texaco Coal Gasification Process utilizing direct quench of gases leaving the gasifier. Courtesy Texaco.)...

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