Method for producing furfural through hydrolysis by using high-pressure two-kettle-cascade acid process
A production method and technology of acid method, which are applied in the field of high-pressure two-kettle string acid hydrolysis to produce furfural, can solve the problems of low equipment utilization rate, low production efficiency, complicated operation process, etc., so as to improve equipment utilization rate and reduce labor cost. , The effect of simplifying the steam series
Inactive Publication Date: 2014-06-25
夏鲁莎
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Problems solved by technology
[0005] This process now seems to have many shortcomings, such as low production efficiency, low equipment utilization rate, and low furfural yield; moreover, the operation process is complicated and the labor cost is high
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[0023] The embodiments described below by referring to the figures are exemplary only for explaining the present invention and should not be construed as limiting the present invention.
[0024] Refer below figure 1 Describe the production method of hydrolyzed furfural by the high-pressure two-tank series acid method according to the embodiment of the present invention.
[0025] The device used in the method of the present invention comprises a round sieve 2, a pulverizer 3, a hoist 4, a steam passing platform 5, a hydrolysis kettle 6, a stock solution tank 7, a condenser 8, an initial distillation tower 9, a condenser 10, a phase separator 11, a refining Workshop 12 and acetal storage tank 13. Among them, the raw material 1 is connected with the round sieve 2, the round sieve 2 is connected with the pulverizer 3, the pulverizer 3 is connected with the hoist 4, the hoist 4 is connected with the top silo, and the top silo is connected with 3 hydrolysis kettles through a convey...
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Abstract
The invention provides a method for producing furfural through hydrolysis by using a high-pressure two-kettle-cascade acid process. The method comprises the steps of feeding a plant fiber raw material and 5-8% dilute sulfuric acid into hydrolysis kettles after uniformly mixing, introducing 1.3Mpa saturated steam to perform hydrolysis, and extracting furfural produced in the process of hydrolysis with the 1.3Mpa saturated steam, wherein the two-kettle-cascade acid process is adopted in the process, namely, three hydrolysis kettles form a group, two of the hydrolysis kettles are connected in series along the flow direction of the saturated steam, and the other hydrolysis kettle is kept in a removed state and is filled with the plant fiber raw material; after the hydrolysis of the two hydrolysis kettles is completed, the hydrolysis kettle subjected to twice hydrolysis is removed and is filled with the plant fiber raw material, and the other two hydrolysis kettles are connected in series and are communicated with the saturated steam to perform hydrolysis and extraction so as to realize the stable and continuous production of crude furfural. The method disclosed by the invention has the beneficial effects that (1) the utilization rate of equipment is increased by 30%; (2) the furfural yield is improved by about 5%; and (3) the steam cascade process is simplified and the labor cost is reduced.
Description
technical field [0001] The invention belongs to the field of furfural production in the chemical industry, and in particular relates to a process for producing furfural by hydrolysis with high-pressure two-pot series acid method. Background technique [0002] Furfural, also known as furan formaldehyde, is an important heterocyclic organic compound. There are more than 1,600 chemical products derived directly or indirectly from furfural, which are widely used in medicine, pesticides, resins, daily chemicals, casting, textiles and Petroleum and other industries. [0003] Furfural production is firstly the preparation of crude furfural, and then the purification of crude furfural. In my country, crude furfural is mainly produced by acid hydrolysis. That is, a certain concentration of dilute sulfuric acid is used as a catalyst, and saturated steam of a specific pressure is added into the hydrolysis kettle to complete the hydrolysis and dehydration of the pentosan in the plant ...
Claims
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Login to View More IPC IPC(8): C07D307/50
CPCC07D307/50
Inventor 魏新民
Owner 夏鲁莎