Method for preparing 1,2-propylene glycol and normal propyl alcohol by using biologic glycerol

Abstract

The invention discloses a method for preparing 1,2-propylene glycol and normal propyl alcohol by using biologic glycerol. The method comprises the following steps: with biologic glycerol of which thepurity is more than or equal to 95% and hydrogen as main raw materials, by adopting a continuous reaction mode, first vaporizing glycerol, followed by atomizing with pre-heated hydrogen, and then carrying out a catalytic hydrogenolysis reaction on a fixed bed, wherein the reaction conditions are as follows: the temperature is 150-250 DEG C, the pressure is 0.8-2.5MPa, the molar ratio of hydrogen to glycerol is (10-50):1, and mass space velocity is 0.2-1.0/h, and while the materials are vaporized, the vaporized materials are allowed to flow through a fixed reaction bed loaded with a hydrogenolysis catalyst to be subjected to a catalytic hydrogenolysis reaction; the hydrogenolysis catalyst is a copper-based catalyst, comprising the following components according to molar ratio: 10-20% of Cu,30-40% of Al, 30-40% of Si, and 1-10% of Zr and rare earth. The method for preparing 1,2-propylene glycol and normal propyl alcohol by using biologic glycerol disclosed by the invention has the advantages of few equipment investment, low production energy consumption and low product cost.

Description

technical field [0001] The invention relates to the technical field of biological glycerin deep processing, in particular to a method for preparing 1,2-propanediol and n-propanol by catalytic hydrogenolysis of biological glycerin. Background technique [0002] In recent years, the biodiesel industry produced from waste oil has developed rapidly. Bioglycerol is a by-product of biodiesel production. The development of downstream products with higher added value is an important research direction to support the development of biodiesel. 1,2-Propanediol is an important chemical raw material, mainly used in the production of unsaturated polyester resin, epoxy resin and polyurethane resin, and can also be used as antifreeze, solvent for dye ink, surfactant, humectant, coolant Wait for use. The by-product n-propanol is mainly used as fungicides for fuel oil, pesticides and pharmaceutical raw materials, spice raw materials, erythromycin, bromopropane, propylparaben, paints, inks, n...

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Problems solved by technology

[0003] In 2016, Jiangsu Kite New Energy invented a process and reaction system for continuous catalytic hydrogenation to prepare 1,2-propanediol. It uses nano-copper as the catalyst of the active component. 1,2-propanediol is prepared by hydrogenation under the process conditions of 6.0MPa and glycerin mass space velocity of 0.2-1.0 / h, which realizes the recycling of raw materials, solvents and hydrogen, but has the following defects: because the method uses methanol, ethanol or water (Preferably methanol) is used as a solvent to dilute glycerin. In the product rectification and separation process, equipment such as solvent recovery rectification tower, solvent recovery tank and dilution tank is required. The equipment investment is large and wastes space cost, and energy consumption is large, and solvent recovery increases time cost.

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