Integrated process of furfural production as well as wastewater, waste slag and waste gas treatment

Abstract

The invention belongs to the technical field of the chemical production, and relates to a technology for optimizing energy saving and integrating treatment of waste water, waste slag and waste gas in a furfural production process, which is suitable for the energy saving and the three-waste treatment and reformation of furfural production enterprises. The technology is characterized in that limestone and dolomite are used for neutralizing furfural waste water to convert acetic acid into calcium magnesium acetate, and then the water exchanges heat with high-temperature aldehyde gas generated by a hydrolysis kettle to enter an evaporator; high-temperature vapor generated by the vaporization of the waste water enters the hydrolysis kettle to be used as a reaction medium, the residual concentrated liquid is decolorized for extracting calcium magnesium acetate salt, and the residual liquid is used for smoke desulfurization and denitration. After the low-pressure automatic heating and vaporization of high-temperature aldehyde slag for furfural recovery, the high-temperature aldehyde slag is dried at a low temperature to reduce the water content of the aldehyde slag to be lower than 20 percent. The invention has the advantages that the utilization rates of materials and energy are greatly increased, the zero discharge of three wastes is realized without additional energy consumption, and the calcium magnesium acetate salt of high value is also prepared. After the automatic heating distillation and low-temperature drying of the aldehyde slag, the aldehyde slag is used for active carbon and is effectively and cleanly burnt.

Description

technical field [0001] The invention belongs to the technical field of chemical production and relates to a process technology, in particular to an integrated process for furfural production process optimization of energy saving and waste water, waste residue and waste gas treatment, which is suitable for furfural production enterprises' energy saving and three waste treatment transformation. Background technique [0002] Furfural production has a wide range of raw materials and simple procedures. Usually, plants rich in polypentoses (such as corncobs) are used as raw materials. In the presence of a catalyst (such as 5% dilute sulfuric acid), they are hydrolyzed to form pentoses in a high-temperature and high-pressure steam atmosphere. , and then under the same conditions, the furfural generated by the dehydration of pentose sugars is taken out by high-temperature water vapor, that is, "aldehyde vapor" with a temperature as high as 140°C is formed, and the "aldehyde vapor" co...

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Problems solved by technology

[0012] The technical problem to be solved by the present invention is to provide an integrated process route for furfural production and waste water, waste residue, and waste gas treatment. Under the premise of optimizing the furfural production process, reducing energy consumption, and improving production efficiency, furfural wastewater, waste residue, and waste gas are treated. Comprehensive treatment to solve the problems of poor synergy between various unit operations in the furfural production process, serious energy dissipation, low production efficiency, large investment in wastewater treatment, high operating costs, and inability to completely treat waste residue and waste gas, so as to realize furfural production and wastewater , Waste residue, waste gas treatment process integration

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