A literature review focuses on the complex formation of diatomic phenols, their solubility in organic solvents, and their extraction from the thermal-processing products of coal by extraction, crystallization and rectification. We know that pyrocatechol and resorcinol are mainly produced from water layers above and below tar in the thermal processing of coal [1,2]. From the water layers under the tar, 2.4-3 kg of pyrocatechol (recalcu-lated for 1 t of processed coal) may be obtained. More pyrocatechol is present in the tar, predominantly in the intermediate oil and in the tar deposited in the electro-filters. Small quantities of diatomic phenols are formed in the semicoking of coal (0.4-0.62 kg/t of coal).
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机译：文献综述集中在双原子酚的复杂形成，它们在有机溶剂中的溶解性以及通过萃取，结晶和精馏从煤的热加工产物中萃取。我们知道，邻苯二酚和间苯二酚主要是由煤热处理过程中焦油上方和下方的水层产生的[1,2]。从焦油下的水层中，可以获得2.4-3 kg的邻苯二酚（对于1吨处理过的煤进行重新计算）。焦油中，主要在中间油中和沉积在电滤器中的焦油中存在更多的邻苯二酚。在煤的半焦化过程中会形成少量的双原子酚（0.4-0.62 kg / t的煤）。
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