发明名称 METHOD AND PLANT FOR THE MANUFACTURE OF FURFURAL FROM XYLOSE SOLUTIONS SUCH AS THE BLACK LIQUOR RESIDUE FROM PULPING PLANTS
摘要 The plant comprises a reactor for hydrolysis under pressure and is characterised in that it comprises at least two devices for decompression and separation (6,16,18), at least one intermediate decompression and separation device (6;16) and a final decompression (18) and separation device; a heat exchanger forming an evaporator (12,14) being arranged between two successive decompression devices, comprising a heating fluid circuit and a cooling fluid circuit, the vapour produced by the decompression device upstream being introduced into the heating fluid circuit to produce an indirect heat exchange with the liquid leaving the downstream decompression device introduced into the cooling fluid circuit, the condensed vapour (CV) being conveyed in liquid phase to the said distillation column, while the vapour produced by at least one intermediate decompression (16) and/or by the final decompression (18) are employed at least partially to superconcentrate the solution and/or to perform a heat exchange with the condensates introduced into the column (8) for their distillation. According to the invention the design of the plant is simplified while the overall heat efficiency is improved.
申请公布号 ZA8604982(B) 申请公布日期 1987.03.25
申请号 ZA19860004982 申请日期 1986.07.04
申请人 COFINPAR S.A.;PIERRE, MARIE, PAUL MAURICE 发明人 PIERRE, MARIE, PAUL MAURICE
分类号 C07D307/50 主分类号 C07D307/50
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