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Process for recovering furfural and sulfuric acid from furfural residues

A technology of furfural slag and furfural, which is applied in the technical field of recovering furfural and sulfuric acid in furfural slag, can solve the problems of furfural slag polluting the environment, insufficient extraction of furfural and sulfuric acid, etc., and achieve the goals of reducing pollution, low operating costs, and improving economic benefits Effect

Active Publication Date: 2013-07-17
山东金缘生物科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In order to overcome the shortcoming of above-mentioned prior art existence, the object of the present invention is to provide a kind of technique of reclaiming furfural and sulfuric acid in furfural residue, to solve the technology that the extraction of furfural and sulfuric acid in furfural residue in the traditional production process is insufficient, and furfural residue pollutes the environment Problem, the present invention can improve the output rate of furfural and realize the recycling of sulfuric acid

Method used

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  • Process for recovering furfural and sulfuric acid from furfural residues

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] (1) When the step of blowing the generated furfural out of the hydrolysis pot 2 with partial pressure steam is completed, close the steam delivery pipeline joint 1 and the aldehyde delivery pipeline joint 3, leave the furfural slag in the hydrolysis pot 2, and open the vacuum pumping Throttle gate 4, water aldehyde vapor is condensed through condenser 5, becomes water aldehyde mixture and is stored in water aldehyde tank 6, when the pressure in hydrolysis pot 2 drops to 1.5Kg / cm 2 At the same time, in the hydrolysis pot 2, inject the water that weight is 10% of furfural slag weight, and open vacuum pump 8, the vacuum degree in the hydrolysis pot 2 remains on 650mmHg, continues to take out 15 minutes, and described vacuum pumping joint 4 passes pipeline and condensing The device 5 is communicated, the condenser 5 is communicated with the water aldehyde tank 6 through the pipeline, the water aldehyde tank 6 is communicated with the vacuum buffer tank 7 through the pipeline...

Embodiment 2

[0019] (1) When the step of blowing the generated furfural out of the hydrolysis pot 2 with partial pressure steam is completed, close the steam delivery pipeline joint 1 and the aldehyde delivery pipeline joint 3, leave the furfural slag in the hydrolysis pot 2, and open the vacuum pumping Throttle gate 4, water aldehyde vapor is condensed through condenser 5, becomes water aldehyde mixture and is stored in water aldehyde tank 6, when the pressure in hydrolysis pot 2 drops to 2.0Kg / cm 2 At the same time, in the hydrolysis pot 2, injecting weight is the water of 20% of furfural slag weight, and open vacuum pump 8, the vacuum degree in the hydrolysis pot 2 remains on 650mmHg, continues to take out 15 minutes, and described vacuumizing joint 4 passes pipeline and condensing The device 5 is communicated, the condenser 5 is communicated with the water aldehyde tank 6 through the pipeline, the water aldehyde tank 6 is communicated with the vacuum buffer tank 7 through the pipeline, ...

Embodiment 3

[0023] (1) When the step of blowing the generated furfural out of the hydrolysis pot 2 with partial pressure steam is completed, close the steam delivery pipeline joint 1 and the aldehyde delivery pipeline joint 3, leave the furfural slag in the hydrolysis pot 2, and open the vacuum pumping Throttle gate 4, water aldehyde vapor is condensed through condenser 5, becomes water aldehyde mixture and is stored in water aldehyde tank 6, when the pressure in hydrolysis pot 2 drops to 1.5Kg / cm 2 At the same time, in the hydrolysis pot 2, inject the water that weight is 10% of furfural slag weight, and open vacuum pump 8, the vacuum degree in the hydrolysis pot 2 remains on 650mmHg, continues to take out 15 minutes, and described vacuum pumping joint 4 passes pipeline and condensing The device 5 is communicated, the condenser 5 is communicated with the water aldehyde tank 6 through the pipeline, the water aldehyde tank 6 is communicated with the vacuum buffer tank 7 through the pipeline...

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Abstract

The invention provides a process for recovering furfural and sulfuric acid from furfural residues. The process is implemented by the following steps of: when the step of blowing the generated furfural off a hydrolysis pot by using partial pressure steam is finished in the production of the furfural, injecting water in an amount which is 10 to 20 percent based on the weight of the furfural residues into the hydrolysis pot when pressure in the hydrolysis pot is reduced to be between 1.5 and 2.0Kg / cm<2>, starting a vacuum pump to ensure that the vacuum degree in the hydrolysis pot is kept at 650mmHg, and continuously vacuumizing for 15 minutes; and condensing the extracted sulfuric-acid-containing water aldehyde steam in a condenser, wherein the temperature of cooling water in the condenser at a water inlet is kept between 15 and 20 DEG C, and the condensation outlet temperature of a sulfuric-acid-containing water aldehyde solution in the condenser is between 48 and 52 DEG C. By the process, air pollution is reduced, the corrosion of the sulfuric acid to subsequent equipment is reduced, the yield of the furfural is increased by 4 to 5 percent, the obtained sulfuric acid can be recycled, economic benefits are improved, and emission reduction is achieved.

Description

technical field [0001] The invention relates to the technical field of furfural production, in particular to a process for recovering furfural and sulfuric acid in furfural slag. Background technique [0002] Furfural, also known as 2-furyl formaldehyde, is an important industrial raw material. Furfural is a commonly used excellent solvent and an important raw material for organic synthesis. It can be condensed with phenol to produce phenol furfural resin similar to bakelite. In the traditional process of furfural production, the following methods are generally adopted: After drying raw materials such as corncobs, cottonseed hulls, and bagasse, they are uniformly mixed with the prepared dilute acid in an acid mixer (or acid mixer), and then The mixed materials are sent to the hydrolysis pot, and under the action of acid catalyst (sulfuric acid, acetic hydrochloric acid, formic acid, phosphoric acid, etc.), the temperature is raised and the pressure is hydrolyzed to obtain pe...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B17/90C07D307/50
CPCY02P20/10
Inventor 杨太敏杨会桐杨太勇杨士涛
Owner 山东金缘生物科技有限公司