Device and method for preparing oxygen-containing liquid fuel by bio-oil catalytic conversion

Patent metadata

Field	Value
Publication number	US-9725653-B2
Application number	US-201214381573-A
Country	US
Kind code	B2
Filing date	Dec 5, 2012
Priority date	Feb 29, 2012
Publication date	Aug 8, 2017
Grant date	Aug 8, 2017

Abstract

Devices and methods for preparing oxygen-containing liquid fuel by bio-oil catalytic conversion. A device includes a biomass fast thermal cracking system for preparing bio-oil, a bio-oil oil-water separating system for separating the bio-oil into oil phase bio-oil and water phase bio-oil that is output to an oil phase bio-oil chemical chain hydrogen production system, and a water phase bio-oil catalytic hydrogenation system. The hydrogen production system outputs produced hydrogen to the water phase bio-oil catalytic hydrogenation system to prepare a liquid fuel. A method includes the steps: thermally cracking the biomass to prepare bio-oil, separating the water phase and the oil phase, producing hydrogen from the oil phase bio-oil through a chemical chain method so as to provide a hydrogen source for the water phase bio-oil to carry out two-stage catalytic hydrogenation in a slurry bed, and separating and purifying the hydrogenated products to obtain an oxygen-containing liquid fuel.

First claim

The invention claimed is:

1. A method for preparing oxygen-containing liquid fuel by catalytic conversion of bio-oil, comprising the following steps:
thermally cracking biomass to produce bio-oil, wherein the bio-oil includes water-phase bio-oil and oil-phase bio-oil;
separating the water-phase bio-oil from the oil-phase bio-oil;
producing hydrogen from the oil-phase bio-oil by a chemical-chain method;
providing the hydrogen produced from the oil-phase bio-oil as a hydrogen source to the water-phase bio-oil;
carrying out a two-step catalytic hydrogenation of the water-phase bio-oil to produce a hydrogenated product, wherein the two-step catalytic hydrogenation comprises (i) a first step which takes place in a first slurry bed catalytic hydrogenation reactor maintained at a temperature of 120-160° C. and a pressure of 3-5 MPa and (ii) a second step which takes lace in a second slurry bed catalytic hydrogenation reactor maintained at a temperature of 200-300° C. and a pressure of 8-15 MPa, and wherein the first step and the second step take place in different slurry beds; and
purifying the hydrogenated product to obtain oxygen-containing liquid fuel.

2. The method of claim 1 , wherein the step of thermally cracking biomass to produce bio-oil further comprises:
adding biomass raw material to a thermal cracker;
mixing a heat carrier with the biomass raw material to obtain a mixture, wherein the mixture flows downwards and undergoes a thermal cracking reaction at a temperature of 500-600° C. to produce a thermal cracking product comprising gas, oil and solid particles;
passing the thermal cracking product through an outlet of the thermal cracker to a gas-solid separator, wherein the solid particles are separated from the oil and gas of the thermal cracking product; and
passing the oil and the gas of the thermal cracking product to a condenser, wherein the bio-oil is obtained upon condensation.

3. The method of claim 1 , wherein the step of separating the water-phase bio-oil from the oil-phase bio-oil further comprises passing the bio-oil to an oil-water separator to obtain the oil-phase bio-oil and the water-phase bio-oil.

4. The method of claim 1 , wherein the step of producing hydrogen from the oil-phase bio-oil by the chemical chain method further comprises:
passing the oil-phase bio-oil to a reduction reactor containing a first metal oxide, wherein the oil-phase bio-oil and the first metal oxide undergo a redox reaction at 900-950° C. to produce a metallic monomer;
passing the metallic monomer and steam to a steam hydrogen generator and reacting the metallic monomer and steam at 800-850° C. to generate hydrogen and a second metal oxide, wherein an oxidation state of the metal in the second metal oxide is less than that of the metal in the first metal oxide;
mixing the second metal oxide with air;
passing the mixture of the second metal oxide and the air to an air reactor wherein the second metal oxide reacts with oxygen in the air at a temperature of 950-970° C. to produce the first metal oxide; and
recycling the first metal oxide to the reduction reactor.

5. The method of claim 1 , wherein the step of carrying out the two-step catalytic hydrogenation of the water-phase bio-oil further comprises:
compressing a first portion of the hydrogen produced by the chemical-chain method in a first compressor, wherein the chemical chain method comprises producing hydrogen from the oil-phase bio-oil in a steam hydrogen generator;
sending the compressed first portion of the hydrogen, the water-phase bio-oil, and a first nickel-based molecular sieve catalyst to the first slurry bed catalytic hydrogenation reactor to produce a first solid-liquid product;
compressing a second portion of the hydrogen produced by the chemical-chain method in a second compressor;
sending the compressed second portion of the hydrogen, the first solid-liquid product, and a second nickel-based molecular sieve catalyst to the second slurry bed catalytic hydrogenation reactor to produce a second solid-liquid product;
sending the second solid-liquid product to a solid-liquid separator to separate out a solid-phase catalyst product from a liquid-phase product;
passing the solid-phase catalyst product to a catalyst reduction unit to remove carbon deposited on a surface of the solid-phase catalyst product to form a regenerated catalyst;
recycling a first portion of the regenerated catalyst to the first slurry bed catalytic hydrogenation reactor;
recycling a second portion of the regenerated catalyst to the second slurry bed catalytic hydrogenation reactor; and
heating and evaporating the liquid-phase product in the solid-liquid separator to produce a gas-phase product.

6. The method of claim 5 , wherein the step of purifying the hydrogenated product to obtain the oxygen-containing liquid fuel further comprises:
passing the gas-phase product and cooling water to a fractionation and purification system to convert the gas-phase product to the oxygen-containing liquid fuel and to convert the cooling water to steam; and
sending the steam to the steam hydrogen generator.

Assignees

• Univ Southeast

Inventors

• Xiao Rui
• Zhang Huiyan
• Zhang Yong
• Shen Dekui

Classifications

• C10L1/02 Primary

  essentially based on components consisting of carbon, hydrogen, and oxygen only · CPC title

• C10G3/45

  containing iron group metals or compounds thereof · CPC title

• C10L2290/543

  Distillation, fractionation or rectification for separating fractions, components or impurities during preparation or upgrading of a fuel · CPC title

• C10G1/002 Primary

  in combination with oil conversion- or refining processes · CPC title

• C10G3/49

  containing crystalline aluminosilicates, e.g. molecular sieves · CPC title