煤变油技术最早在二十世纪上半叶由德国人发明,其后荷兰、美国、日本等国都曾进行过研究,而开发应用最成功的国家是南非。为什么掌握了成熟煤炭合成油生产工艺的美国、德国这些国家没有进行商业化生产呢? Coal-to-oil technology was first invented by Germans in the first half of the twentieth century. Later, countries such as the Netherlands, the United States and Japan conducted research. The most successful country for development and application was South Africa. Why mastered the production of synthetic coal mature technology in the United States, Germany, these countries did not commercialize it?