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

A technology for n-propanol and propylene glycol is applied in the field of biological glycerol catalytic hydrogenolysis to prepare 1,2-propanediol and n-propanol, which can solve the problems of increased time cost, wasted space cost, large equipment investment, etc. The effect of high utilization rate, equipment cost saving and long catalytic life

Inactive Publication Date: 2018-02-09
龙岩卓越生物基材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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.

Method used

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

Examples

Experimental program
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Effect test

Embodiment 1

[0032] Reaction conditions:

[0033]A fixed-bed continuous reaction device filled with a copper-based catalyst is used to continuously feed glycerin and hydrogen. The glycerin preheater is 70°C, the hydrogen preheater is 220°C, and the hydrogen gas enters the reactor together after the glycerin is vaporized in the 220°C vaporization tank. The bed temperature is 220°C, the reaction pressure is 1.0MPa, the mass space velocity is 0.5 / h, and the molar ratio of hydrogen to oil is 30:1. Reaction excess hydrogen enters the tail gas buffer tank, control the pressure of the left and right pre-pressurized buffer tanks V4 and V3 to 0.55-0.60MPa, the pressure of the high-pressure buffer tank V5 and the pressure of the stabilized buffer tank V6 to 1.4-1.45MPa, and the pressure of the stabilized buffer tank V6 to decompress at the outlet The valve pressure is 1.2MPa, and the left and right booster pumps P2 and P1 are automatically controlled alternately at an interval of 240s. The reaction...

Embodiment 2

[0035] Reaction conditions:

[0036] The basic process of the process is the same as in Example 1. The preheating temperature of hydrogen and glycerin, the temperature of glycerin vaporization tank and the temperature of reaction bed remain unchanged, and the difference in process parameters lies in mass space velocity of 0.6 / h, hydrogen-oil ratio of 25:1, reaction system pressure of 0.8MPa, left and right pre-pressurized buffer tanks The pressure of V3 and V4 is 0.50-0.55MPa, the pressure of high-pressure buffer tank V5 and pressure-stabilizing buffer tank V6 is 1.20-1.25MPa, the pressure of pressure-reducing valve at the outlet of voltage-stabilizing buffer tank V6 is 1.0MPa, and the left and right booster pumps P2 and P1 are automatically controlled at an interval of 240s Used interchangeably. The hydrogenation reaction lasted for 840 hours, and the equipment in the reaction process operated stably, and the hydrogen circulation was good. Take comprehensive samples of coll...

Embodiment 3

[0038] The basic process of the process is the same as in Example 1. The preheating temperature of hydrogen and glycerin, the temperature of glycerin vaporization tank and the temperature of reaction bed remain unchanged. The difference in process parameters is that the mass space velocity is 0.8 / h, the ratio of hydrogen to oil is 20:1, the pressure of the reaction system is 1.0MPa, and the left and right pre-pressurized buffer tanks The pressure of V3 and V4 is 0.50-0.55MPa, the pressure of high-pressure buffer tank V5 and pressure-stabilizing buffer tank V6 is 1.20-1.25MPa, the pressure of pressure-reducing valve at the outlet of V6 of stabilizing buffer tank is 1.2MPa, and the interval between left and right booster pumps P2 and P1 is automatically controlled by 240s Used interchangeably. The hydrogenation reaction lasted for 840 hours, and the equipment in the reaction process operated stably, and the hydrogen circulation was good. Take comprehensive samples of collection...

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PUM

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C29/145C07C31/20C07C29/00C07C31/10B01J23/83
CPCB01J23/83C07C29/00C07C29/145C07C45/52C07C31/205C07C31/10C07C49/17
Inventor 叶活动陈丹林泽虎陈建洪
Owner 龙岩卓越生物基材料有限公司
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