Product Details

Use Corn cob or Rice husk to Making Furfural Produced by Doing

Product Description of Use Corn cob or Rice husk to Making Furfural Produced by Doing

The furfural was discovered by Derbynier, a German chemist, in 1832.At that time, when produced formic acidby using mixed liquor of sulfuric acid and manganese dioxide and sucrose, a kind of by-product which was called“Artificial Formic Acid oil” was produced, too. Later, there was someone who got this kind of oil from rice bran in

1845, and then it was called “Furfural” generally.

Working Process of Use Corn cob or Rice husk to Making Furfural Produced by Doing

Continuous rectification process and the traditional process’s economic and technical parameters comparative statement:

Process name Item	Alkali Neutralize acid and intermittent rectification process	Alkali Neutralize acid and continuous rectification process	continuous deacidification and dehydration and continuous rectification process
Production control	intermittent control for each batch and frequently alternate operation	intermittent neutralization for each batch andcontinuous rectification operation	strong process continuity and easy control operation
Production capacity	general production capacity	general production capacity	strong adaptability
Operator capacity	3 shifts × 25 = 75	3shifts x24=72	3shifts x17=51
side-reaction of alkali neutralization	It will cause a series of side reaction, having a certain influence on product quality and refined rate	It will cause a series of side reaction, having a certain influence on product quality and refined rate	Remove the process of using alkali to neutralize acid Process, there is no occurrence of side reaction
product purity	≥98.5%	≥98.5%	≥99.0%
Refining yield	coarse aldehyde content≥90%, Yield≥85%	coarse aldehyde content≥90% Yield≥84.5%	coarse aldehyde content≥90%, Yield≥86.5%
Equipment investment	normal investment	normal investment	Investment of increasing self-control and continuous rectification equipment is 0.5 million
Aldehyde mud processing (i.e. the high boiling point material)	The waste discharged after aldehyde mud washing has impact on the environment, which will raise governance cost	It will be directly send to the user without refining the furfural	Redistillation of high boiling material can get 50% of aldehydes ,the residue after distillation will go through boiler combustion
Corn cob consumption (made in Hebei,Shandong and Henan province)	Producing a ton finished furfural consumes 8.5t dry basis corn cob	Producing a ton finished furfural consumes 8.7t dry basis corn cob	Producing a ton finished furfural consumes less than 8t dry basis corn cob

More information about furfural

I. The theoretical knowledge of furfural

1. Summary

Furfural also can be called furan formaldehyde,( -furan formaldehyde)

Structural formula:

Molecular formula: (Molecular formula:C5H4O2;Structural formula:C4H3O.CHO )

Molecular weight :96.08

2. The main physical constant

density:( n20)1.1598 g/cm3

refractive index:(n20D)1.524

boiling point:(101.325 KPa ) 161.7℃

specific gravity:(d20)1.1598

freezing point:- 36.5℃

autoignition temperature(ignition point):315℃

flashing point: 60℃

lower explosive:2.1%

upper explosive limit:19.3%

II. Chemistry of Furfural production

(C5H8O4) n +nH2O n(C5H10O5) n(C5H4O2)

Poly pentose pentose furfural

1. Flow chart

2. Description of the process:

To crush raw material(corncob) into 15-18mm particles -->To deliver those particles by the elevator into the feeder--> To uniformly mix them with 5% dilute sulfuric acid--> To put them into the hydrolysis reactor--> To hydrolyze them by introducing steam with 0.8-0.9MPa pressure (temperature 170 ℃, hydrolysis time 3.5h)-->To condense furfural gas into 80-90 ℃ liquid-->To flow them into the crude distillation (continuously, normal pressure) with maintaining the bottom temperature of 103-106 ℃and the top temperature 98-100 ℃ -->To condense the gas in the crude distillation into 50-60 ℃liquid by branch-furfural condenser into branch furfural tank--> To neutralize the raw furfural with a small amount of soda ash-->To flow into distillation (intermittently, negative pressure -0.08MPa)-->To get furfural (content> 99%)-->To separately flow aqueous furfural (furfural content 11%) back into the crude distillation .

III.Furfural international standard

Industrial furfural technical requirements GB1926.1-2009

Item	Premium grade	First grade	Second grade
Appearance	light yellow to amber transparency liquid, no suspended solids and mechanical impurities
Density(p20)/(g/cm3)	1.158—1.161
Refractive index(n20D)	1.524—1.527
Moisture/% ≤	0.05	0.10	0.20
Acidity/(mol/L) ≤	0.008	0.016	0.016
Furfural content /% ≥	99.0	98.5	98.5
Initial boiling point /℃ ≥	155	150	—
Fraction before 158℃ 158℃/%≤	2	—	—
Total distillation /% ≥	99.0	98.5	—
Final boiling point /℃ ≤	170	170	—
Residue/% ≤	1.0	—	—