Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Method for continuously rectifying and refining furfural and accessory low-boiling-point substance

A technology of low boiling matter and furfural, which is applied in the field of continuous distillation and refining, can solve the problems of unreasonable furfural refining process, etc., and achieve the effects of preventing the risk of reaction to form resin, easy handling and cost reduction

Inactive Publication Date: 2019-05-03
TIANJIN UNIV
View PDF2 Cites 2 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The process flow is also designed around furfural, which is obviously unreasonable for the real furfural refining process

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Method for continuously rectifying and refining furfural and accessory low-boiling-point substance
  • Method for continuously rectifying and refining furfural and accessory low-boiling-point substance

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] After heat exchange, the feed temperature is 35°C, the flow rate is 20000kg / hr, and the content of each component is: the mass fraction of furfural is 16.5%, methanol and acetone are 5%, acetic acid is 8%, formic acid is 0.5%, and water is 64%. The rest is the furfural hydrolyzate with heavy impurities mainly 5-methylfurfural, which is pumped into the light removal tower from the upper part of the tower, and acetone and methanol with lower boiling points are extracted from the top of the light removal tower, and the bottom liquid of the tower is a dilute solution of furfural , the light component methanol and acetone in the tower still liquid are almost completely removed, and the methanol content in the tower still is less than or equal to 50ppm. is 13; the light removal tower is operated under normal pressure, the operating pressure at the top of the tower is 100kPa, and the pressure at the bottom of the tower is about 105kPa; at this time, the temperature at the top o...

Embodiment 2

[0035] After heat exchange, the feed temperature is 38°C, the flow rate is 18000kg / hr, and the content of each component is: the mass fraction of furfural is 16.5%, methanol and acetone are 5%, acetic acid is 8%, and formic acid is 0.5%. , water 64%, and the rest is the furfural hydrolyzate of heavy impurities mainly based on 5-methylfurfural. The pump enters the light removal tower from the top of the tower, and acetone and methanol with lower boiling points are extracted from the top of the light removal tower. It is a dilute solution of furfural, and the light components methanol and acetone in the tower kettle liquid are almost completely removed, and the methanol content in the tower kettle is ≤50ppm. 7 plates, the reflux ratio is 8; the light removal tower is operated under normal pressure, the operating pressure at the top of the tower is 102kPa, and the pressure of the tower bottom is about 107kPa; The acetone and methanol light components at the top of the light tower...

Embodiment 3

[0037]After heat exchange, the feed temperature is 35°C, the flow rate is 22000kg / hr, and the content of each component is: the mass fraction of furfural is 16.5%, methanol and acetone are 5%, acetic acid is 8%, and formic acid is 0.5%. , water 64%, and the rest is the furfural hydrolyzate of heavy impurities mainly based on 5-methylfurfural. The pump enters the light removal tower from the top of the tower, and acetone and methanol with lower boiling points are extracted from the top of the light removal tower. It is a dilute solution of furfural, and the light components methanol and acetone in the tower kettle liquid are almost completely removed, and the methanol content in the tower kettle is ≤50ppm. 10 blocks, with a reflux ratio of 8; the light removal tower is operated at normal pressure, the operating pressure at the top of the tower is 105kPa, and the pressure of the tower bottom is about 110kPa; The acetone and methanol light components at the top of the tower are p...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention discloses a method for continuously rectifying and refining furfural and an accessory low-boiling-point substance. The method comprises the following steps: feeding a pretreated furfuralhydrolysate into a light component removal tower by a pump, extracting acetone and methanol from the top of the tower, allowing the acetone and methanol to enter an acetone product tower and a methanol product tower respectively, and using water as an extractant for the acetone product tower to respectively obtain an acetone product and a methanol product; extracting a dilute aldehyde solution from the bottom of the light component removal tower, feeding the dilute aldehyde solution into an azeotropic primary distillation tower by a pump, obtaining a furfural-water azeotrope from the top ofthe tower, allowing the azeotrope to enter a phase separator, performing condensation and phase separation, returning the obtained water phase to the primary distillation tower, and allowing the obtained aldehyde phase to enter a dehydration tower to remove residual water and acids; feeding acid-containing residues obtained from the top of the dehydration tower and a solution obtained from the bottom of the primary distillation tower into an acetic acid product tower by a pump, extracting wastewater from the top of the tower, extracting an acetic acid product from the lateral line of the tower, mixing a solution obtained from the bottom of the acetic acid product tower with the solution obtained from the bottom of the light component removal tower, and adding the obtained mixed solution to enter a furfural refining tower; and obtaining a furfural product from the top of the aldehyde refining tower, and extracting heavy impurities from the bottom of the tower. The method has the characteristics of high product purity, large variety quantity of products, high yield and low pollution.

Description

technical field [0001] The invention relates to a method for separating and purifying furfural hydrolyzate, in particular to a new method for continuous rectification and refining with furfural as the main product and acetone, methanol and acetic acid as secondary products. Background technique [0002] Furfural, also known as furan formaldehyde, is an important organic chemical raw material and production solvent. Its application is very extensive, the main use is as the raw material for the production of furfuryl alcohol, the second is as the additive of lubricating oil in petrochemical industry, and it can be used as the reactant of rubber and dye or directly used in food, medicine, pesticide and other fields. Therefore, the demand for furfural has been continuously increasing. Furfural, as a chemical that cannot be synthesized from chemical raw materials so far but can only be produced by hydrolysis of plant cellulose such as corncobs, bagasse and wheat straw, has many ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): C07C45/82C07C49/08C07C29/80C07C31/04C07C51/44C07C53/08
Inventor 冯惠生孙德章王强
Owner TIANJIN UNIV
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com