China’s Coal Future

China’s coal-to-chemicals gasification plants have employed Fischer-Tropsch for decades to yield products such as synthetic fertilizers and methanol.

Shenhua’s plant, in contrast, chose Fischer-Tropsch’s lesser-known rival, invented by Friedrich Bergius a decade earlier. Though used extensively by the Nazis, Bergius’s process was subsequently abandoned. The process has come to be known as direct liquefaction, because it bypasses the syngas step. In direct liquefaction, the bulk of the coal is pulverized and blended with some of the plant’s synthetic oil, then treated with hydrogen and heated to 450
Beyond the risks inherent in the large-scale deployment of unproven technology, the gasification building boom also is an environmental gamble. Indeed, what may ultimately check China’s coal-to-oil ambitions is water. China’s Coal Research Institute estimates that Shenhua’s plant will consume 10 tons of water for every ton of synthetic oil produced (360 gallons of water per barrel of oil), and the ratio is even worse for Fischer-Tropsch plants.

Technology Review