Process and device for producing furol by two step continuous low pressure high temperature dynamic hydrolysis method
A process equipment and a hydrolysis method are applied in the field of two-step continuous low-pressure high-temperature dynamic hydrolysis to produce furfural technology and equipment, which can solve problems such as slowing down the reaction speed, ensure stability, ensure reliability, and reduce secondary distillation losses. Effect
Inactive Publication Date: 2007-02-14
王义 +1
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Problems solved by technology
[0012] The purpose of this invention is to provide a kind of two-step continuous low-pressure high-temperature dynamic hydrolysis method to produce furfural technology and equipment, solve following four technical problems: one is: the two-step hydrolysis reaction in the furfural production is separated under the premise that the reaction is not interrupted, Completed separately under their respective suitable process conditions; the second is: "slow down" the second step hydrolysis reaction speed, control the relationship between furfural vapor phase concentration, temperature and time, so that the pentose sugar in the material is gradually hydrolyzed, and the reaction speed is increased. slow, to prevent a large amount of pentoses from taking place in the second step of chemical reaction at the same time, resulting in excessive concentration of aldehydes in the gas phase and metathesis reactions, so that pentoses and aldehydes are fully protected; the third is: the furfural vapor generated in the second step of hydrolysis reaction is quickly combined with Separation of solid materials, rapid reduction of furfural temperature, and rapid departure from the high-temperature range; fourth: provide a set of equipment suitable for the above-mentioned production process conditions to ensure the realization of the two-step continuous low-pressure high-temperature dynamic hydrolysis process for furfural production and increase furfural output
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Embodiment 1
[0037] 1. Two-step continuous low-pressure high-temperature dynamic hydrolysis process equipment for furfural production:
[0038] (1) Continuous pressure hydrolysis kettle: such as figure 1 , figure 2 As shown, the continuous pressure hydrolysis kettle 1 is equipped with a continuous feed column 6, which is connected to the hydrolysis kettle. The upper head of the hydrolysis kettle 1 is a standard elliptical head 5, the bottom of the kettle is a standard 60-degree conical head 3, and the lower opening of the head has a slag discharge port 4, which is flange-connected with an S-shaped slag discharge pipe 28. An annular porous steam injection pipe is installed in the conical head 3, and the inlet pipe 39 of the annular porous steam injection pipe is connected with the external steam inlet pipe of the hydrolysis kettle 1, and the superheated steam at 180 ± 5°C is supplied to the kettle, and the steam pressure is 3-4kg / cm 2 , and install an automatic control steam intake dev...
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The present invention discloses two-step continuous low pressure and high temperature dynamic hydrolysis process and apparatus for producing furol. The technological process has its polypentose hydrolysis completed inside the continuous pressure material feeder at temperature of 85-125 deg.c, and pentose hydrolysis completed inside the material feeding coloumn. The main apparatus includes control hydrolysis reactor, slag separator, cooler, furol separator, slag discharger, separator, heater and fan. Compared with the one-step process, the present invention has 15 % raised material utilization and 4-5 % raised furol yield.
Description
Technical field: [0001] The invention belongs to a production method of furfural, and in particular relates to a process and equipment for producing furfural (furan formaldehyde) by a two-step continuous low-pressure high-temperature dynamic hydrolysis method. Background technique: [0002] Domestic production of furfural has been using one-step hydrolysis (also known as discontinuous hydrolysis) for more than 50 years. The yield of furfural has been between 7-8% (the moisture content of corn cob is 15%), and the rate of aldehyde production is low. The material consumption is high, each ton of aldehyde consumes 12.5-13.84 tons of corncobs, 240-300 kg of sulfuric acid, 3-15 kg of soda ash, and 500-900 degrees of electricity. The steam consumption per ton of fine aldehyde is 35-40T (the steam for hydrolysis is 15.5 tons / ton of crude aldehyde). Due to the high material consumption per ton of aldehyde, the product cost is high and the economic benefit is low. (Extracted from F...
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IPC IPC(8): C07D307/48
Inventor 王义王军
Owner 王义