Method for promoting poplar to be efficiently converted into dibutyl phthalate by using gradient hydrothermal liquefaction technology
A technology of dibutyl phthalate and hydrothermal liquefaction, which is applied in the field of agricultural waste conversion and utilization, can solve the problems of difficult recycling of homogeneous catalysis, high cost of hydrothermal liquefaction, etc.
Inactive Publication Date: 2021-04-09
ANHUI UNIVERSITY OF TECHNOLOGY
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Problems solved by technology
[0004] In previous studies, one-step catalytic hydrothermal liquefaction must rely on high-efficiency catalysts to liquefy biomass to obtain bio-oil with high conversion rate. Although it has a significant effect, more catalysis is limited to homogeneous catalysis and is difficult to recycle. , the cost of hydrothermal liquefaction is very large over time
Method used
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Experimental program
Comparison scheme
Effect test
Embodiment 1
[0025] Poplar sawdust is crushed into slightly fine powder without drying, and its water content is measured with a moisture meter, and 70 grams of dry sample (absolutely dry mass after deducting water content) is taken as the raw material for hydrothermal liquefaction. Better than get 700ml distilled water, then get 1wt% (based on raw material dry sample) of Na 2 CO 3 Put into 700ml of distilled water as a base catalyst. Put the above raw materials and solution together into a 1.2L high-pressure reactor, the reaction temperature is gradient HTL220°C, stay at this temperature point for 20 minutes, after the reaction is completed, cool and then take out the contents of the kettle, filter through filter paper, and separate the filtrate from the residue. The filtrate was concentrated into a light oil (LO 1 ). Then the residue after the suction filtration is fully eluted with 400ml of dichloromethane, and then suction-filtered with filter paper, the residue after the elution is...
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Abstract
The invention discloses a method for promoting poplar to be efficiently converted into dibutyl phthalate by using a gradient hydrothermal liquefaction technology, which comprises the following steps: designing liquefaction temperature as three temperature points, putting raw materials and a homogeneous catalyst into a reaction kettle, heating to a first temperature point, standing for a certain period of time, and then putting into a cooling reactor; taking out a product and separating out residue SR; concentrating the water phase into LO through rotary evaporation, eluting the SR with an eluent to obtain a residue phase and an LO phase, drying the residue obtained in the previous step, and continuously carrying out hydrothermal liquefaction in the next step; wherein the selected solid-to-liquid ratio is consistent with that in the previous step, then heating to a second temperature point, standing for the same time, then placing in a cooling reactor, separating and concentrating according to the consistency of the first reaction stage, and stopping gradient liquefaction until the third temperature point is liquefied. The optimal liquefaction form of each component of the poplar can be realized by utilizing gradient hydrothermal liquefaction, and the monomer yield of dibutyl phthalate in an oil phase is greatly improved.
Description
technical field [0001] The invention relates to the technical field of transformation and utilization of agricultural waste, in particular to a method for promoting the efficient transformation of poplar into dibutyl phthalate by utilizing gradient hydrothermal liquefaction technology. Background technique [0002] As a major energy country in the world, my country has abundant biomass resources. Biomass itself has the characteristics of low sulfur, nitrogen and low ash. At the same time, the absorption of carbon dioxide in the growth of biomass and the carbon dioxide emission brought by its conversion can maintain a balanced relationship, which makes the application of biomass more and more researched. favored by those. With the continuous advancement of science and technology and the increasing shortage of fossil resources, it is imminent to solve the problem of energy shortage, making biomass occupy an increasingly important position in renewable energy. In order to rea...
Claims
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IPC IPC(8): C10G1/00C07C67/00C07C69/80B01J27/232
CPCC10G1/002C07C67/00B01J27/232
Inventor 徐建吴海军杨超华左宗涛顾帅令王标张楷徐霞
Owner ANHUI UNIVERSITY OF TECHNOLOGY