CN1459508A

CN1459508A - Cleaing method of sulfurous acid method produced syrup

Info

Publication number: CN1459508A
Application number: CN 03111797
Authority: CN
Inventors: 王兆群; 王兆伟; 王兆强
Original assignee: 王兆群
Priority date: 2003-01-23
Filing date: 2003-01-23
Publication date: 2003-12-03

Abstract

A clean process for preparing syrup by sulfurous acid method features that the mixture of fume and fermenting gas, is used as the aerating gas for lower cost, a carbon method for aerating gas is used, which features that the pH value in aerating tank is controlled by the quantity of added lime for preventing high-temp strong-alkaline environment, and the adding lime and aerating are performed in short time for fully saturation of syrup mixture and CO2 and preventing decomposition of reducing sugar. Its advantages are high clean effect and efficiency.

Description

A kind of sulfurous method is produced syrupy purification method

One, technical field

The invention belongs to sulfurous method and produce the syrup technical field, especially relate to a kind of syrupy method of producing with flue gas and the continuous peace and quiet sulfurous method of fermentation gas.

Two, background technology

In the sulfurous method Closed Circulation in Sugar Production, because sulfurous method is to the deficiency of juice,liming effect, contain a large amount of impurity and non-sugar in the syrup, serious restriction commerieal sugar quality, the only way that improves the commerieal sugar quality of sulfitation sugar mill carries out peace and quiet processing to syrup exactly, removes magazine and non-sugar in the syrup.At present, some sulfitation sugar mills mainly adopt the peace and quiet mixing molasses of phosphoric acid floating method, this technology is that syrup is heated to 80-85 ℃, add phosphoric acid, milk of lime and flocculation agent, and syrup inflated, reaction generates the calcium phosphate throw out that has bubble, impurity and non-sugar in the absorption syrup, and come-up forms scum silica frost in floating clanner, scum silica frost is scraped off can obtain to clean syrup, this method complex process, processing parameter is had relatively high expectations, and parameter is wayward, and purification effect is not high, the effect instability, percent of decolourization is low, and process loss is big, syrup strainability extreme difference, existing carbon method full charge method only is applicable to the clarifying syrup or the molten again syrup of raw sugar in carbon method sugar refinery, the lime-kiln gas of its use simultaneously, cost are than higher, if directly use this method in the syrup that sulfurous method is produced, reducing sugar in then can the considerable damage syrup makes peace and quiet deleterious.

Three, summary of the invention

The objective of the invention is to improve the deficiency of prior art and simple, the peace and quiet effect stability of a kind of technology, efficient height be provided, utilize waste gas, sulfurous method that cost is low produces syrupy on-line continuous purification method.

The object of the present invention is achieved like this, and a kind of sulfurous method is produced syrupy purification method, is characterized in that this method may further comprise the steps:

A, the evaporating sugar-molasses syrup in inferior method sugar refinery and remelt syrup mixed form mixing molasses, maintain the temperature at 65-70 ℃, the hammer degree is at 55-65 ° of Bx;

B, mixing molasses is added the milk of lime that degree Beaume is 12-18%, add-on is syrupy 1.2-2.0%, mixes rapidly, enters full charge in the filling-up pot, and syrupy pH value remains between the 7.5-8 in the filling-up pot, by the pH value that adds in the ash amount control filling-up pot;

C, carbon dioxide is charged in the filling-up pot,, generate precipitation of calcium carbonate, impurity and non-sugar in absorption, the cohesion syrup with syrup and milk of lime mixture reaction;

Syrup after d, the full charge enters into well heater again and is heated to 80-85 ℃, reduces viscosity;

E, the syrup that will reduce viscosity are put into the sheet frame squeezing machine and are filtered, and promptly obtain peace and quiet syrup.

In order further to realize purpose of the present invention, can be used carbonic acid gas for through the flue gas of washing with through the gas mixture of the fermentation gas of froth breaking, the content of carbonic acid gas is 60-90% in the gas mixture.

Compared with the prior art the present invention has following distinguishing feature and positively effect: the present invention adopts the gas mixture of flue gas and fermentation gas as full charge gas, do not use lime-kiln gas, cost reduces greatly, adopt carbon method full charge method, control syrupy pH value between 7.5-8, temperature is below 70 ℃, by the pH value that adds in the ash amount control filling-up pot, thereby do not form the high temperature strong alkali environment, adding ash simultaneously finishes in the extremely short time with full charge, make syrup mixture and carbonic acid gas full charge cmpletely, guaranteed the least possible decomposition of the reducing sugar in the syrup, improved peace and quiet effect.Four, specific embodiments

Below in conjunction with specific embodiment the present invention is described in further detail.

Embodiment, a kind of sulfurous method is produced syrupy purification method, be that evaporating sugar-molasses syrup and remelt syrup are mixed the formation mixing molasses, the temperature of mixing molasses remains on 65-70 ℃, the hammer degree is at 55-65 ° of Bx, with adding degree Beaume in the mixing molasses is the milk of lime of 12-18%, the add-on of milk of lime is syrupy 1.2-2.0%, be mixed and fed into full charge in the filling-up pot rapidly, adding ash amount by control keeps in the filling-up pot syrupy pH value between 7.5-8, carbon dioxide is charged in the filling-up pot,, generate precipitation of calcium carbonate with syrup and the abundant full charge reaction of milk of lime mixture, absorption, impurity and non-sugar in the cohesion syrup, syrup after the full charge enters into well heater again and is heated to 80-85 ℃, to reduce viscosity, increases stability, the syrup that reduces viscosity is put into the sheet frame squeezing machine to be filtered, promptly obtain peace and quiet syrup, the carbonic acid gas of use is flue gas that passes through washing and the gas mixture that passes through the fermentation gas of froth breaking, guarantees in the gas mixture that the content of carbonic acid gas is 60-90%.

Key of the present invention is to guarantee to add ash to finish in the short as far as possible time with full charge, milk of lime will mix with syrup and is even with carbon dioxide reaction, local full charge deficiency or overcarbonation phenomenon can not appear, syrup temp can not be above 70 ℃, guarantee not form the high temperature strong alkali environment, make the least possible decomposition and the conversion of reducing sugar in the syrup, otherwise decomposition of reducing sugar will produce a large amount of non-sugar, make peace and quiet effect just poor, adopt the inventive method can reduce mixing molasses colour 30%, purity of syrup can improve 3-4 percentage point, and the top grade commerieal sugar can be produced in inferior method sugar refinery.

Claims

1, a kind of sulfurous method is produced syrupy purification method, it is characterized in that this method may further comprise the steps:

2, a kind of sulfurous method according to claim 1 is produced syrupy purification method, it is characterized in that used carbonic acid gas is flue gas that passes through washing and the gas mixture that passes through the fermentation gas of froth breaking, and the content of carbonic acid gas is 60-90% in the gas mixture.