CN87108285A

CN87108285A - Floating method replaces the clarification process of whole-juice filtering retro-dissolved syrup

Info

Publication number: CN87108285A
Application number: CN87108285.3A
Authority: CN
Inventors: 刘韶安
Original assignee: SHITOU SUGARCANE CHEMICAL FACTORY GUANGDONG PROV
Current assignee: SHITOU SUGARCANE CHEMICAL FACTORY GUANGDONG PROV
Priority date: 1987-12-29
Filing date: 1987-12-29
Publication date: 1988-07-27
Also published as: CN1011042B

Abstract

The invention belongs to and adopt floating method to reach the method that syrup purifies in the sugar industry.It is through secondary phosphoric acid floating method (add phosphoric acid, add flocculation agent), again through special buoyance lift device separation scum silica frost at the retro-dissolved syrup after the carbonation heating.With clean plasm, floating clear syrup send boiling sugar building, directly boiling high-quality white sugar.The characteristics of present method are to pass through the whole-juice filtering operation.Adopt floating method to replace the retro-dissolved syrup clarification process of whole-juice filtering, have easy and simple to handle, save facility investment, save the labour, the advantage that cost is low, and, can guarantee white sugar quality like this than the syrup decolorization rate of whole-juice filtering, degree and sugar hammer degree height clearly, sugared steam consumption is boiled in saving, improves equipment capacity.

Description

The invention belongs to syrup purifying method in the sugar industry.

The preparation of refined sugar is normally with containing the raw sugar of sugar part more than 96% in the sugar industry, after washing (multiple sieve) decolouring through the honey of whizzer earlier, add the syrup of water Hui Rong or directly become syrup by the sucrose mix juice evaporation concentration, through certain purifying treatment such as carbonatation process, the phosphoric acid lime method, which kind of treatment process no matter diatomite filtration methods etc. adopt, the syrup after the processing all directly boiling go out refined sugar.The technology of always making refined sugar both at home and abroad all is to adopt SO ₂Or CO ₂Behind the syrup process whole-juice filtering after the processing, again through bone carbon, gac, or the purified syrup after the ion-exchange resins decolouring processing boils.Retro-dissolved syrup described in the described production of refined sugar by upward floation of phosphoric acid after saturated with carbonic acid of CN85108102 also is at carbonation, after the heating through the whole-juice filtering operation.Because the total calcium of saturated with syrup is on the low side, the particulate footpath is little, and viscosity is big, filters very difficultly, so the filter plant investment is big, labour intensity is big, filters the sugar part of causing simultaneously and loses manyly, and yield is low.As adopt leaf filter to filter, the filtered juice of filtering the initial stage is muddy, as adopting pressure filter regular meeting " quick-fried sieve " to occur thus phenomenon influences syrupy clarity, and directly influence output and quality.Filter operation at present, the leaf filters that adopt more, give in screen surface and to be coated with, or in syrup, add flocculating aids and improve syrupy filtrability, the clear 59-159799(A of JP and for example) disclosed liquid glucose defecation method is to add strongly basic anion exchange resin in the syrup behind carbonation to improve syrupy degree of filter.Be which kind of means all still need be filtered operation, and increased production cost.

The present invention is a kind of less investment that proposes in order to overcome the above-mentioned time existing shortcoming of molten slurry whole-juice filtering, and production cost is low, and labour intensity is little, and the yield height guarantees the syrup purifying method of refining quality and replaces syrup whole-juice filtering operation.

The present invention is a kind of syrup purifying method that replaces whole-juice filtering with floating method.It is with return molten slurry or directly by the sugarcane juice lime method handle the back concentrate the syrup carbonation, add flocculation agent after heating, getting blisters, regulate pH8.0-9.0 by special come-up device with phosphoric acid, peace and quiet syrup is separated with scum silica frost, clean plasm can directly be sent into phosphoric acid come-up device for the second time, but the syrup direct sending boiling sugar building after secondary floats clearly, but boiling top grade white sugar and refined sugar.

Be described in detail technology of the present invention below in conjunction with accompanying drawing.

Accompanying drawing: be full charge retro-dissolved syrup floating method process flow sheet.

Number in the figure: (1) full charge slurry case (2) phosphoric acid case (3) bubbler

(4) mixing tank (5) flocculation agent case (6) come-up device (7) dross box

(8) pressure filter (9) filter residue is discharged worm conveyer (10) clean plasm case

Usually with raw sugar (pol 96%, moisture content 0.5～1%, reduced sugar 0.3～0.5%, ash 0.35～0.60%, after colour 3000～4000ICUMSA) is washed (multiple sieve) decolouring through the honey of centrifuge earlier, add 75～90 ℃ of water heating-up temperatures and return melt into remelt syrup (sugar hammer degree 60～65Bx, about pH6.5, colour 1000～2000ICUMSA), adding milk of lime (6～8Be ') makes back the total calcium of molten slurry reach 0.3～0.6CaO%Bx, after the flue gas full charge of washing, send into full charge case (1) again, situation depending on pH adds 20-100 mg/kg of Bx phosphoric acid adjust pH by phosphoric acid case (2), and control basicity is sent into blender (8) at 200～300 milliliters/liter by mechanical bubbler (3), add an amount of flocculant by flocculant case (5), general 10～20 mg/kgs of Bx are advisable. The purpose that adds flocculant is the impurity particle coagulation that makes in the syrup, proportion alleviate and on float on liquid level, commercially available flocculant kind is a lot, available chemical floc is available natural flocculant such as sodium alginate also, tea seed pulp water solution etc., consider production cost and meet the requirement of food industry, generally use polyacrylamide. Then, remelt syrup is left standstill 20-40 minute scum silica frost through come-up device (6) just to float naturally, the scum silica frost of come-up utilizes scraper plate to remove, send into dross box (7), the sediment of come-up device bottom is also put into dross box (7) in the lump, middle clarification syrup layer is about back 90～93% of molten slurry amount, sends into clean plasm case (10) with siphon through the clean plasm overfall. Scum silica frost in the dross box still contains many sugar parts, account for 7～10% of overfall amount, with this part scum silica frost thin up to 45～50Bx, filter with being pumped into filter press (8), filter mud is discharged spiral conveyer (9) by filter residue and is discharged, and filtrate is sent into behind the clean plasm case (15) with above-mentioned clear syrup in the lump with being pumped into next bleaching process.

Adopt saturated with syrup floating method clarification process than the peace and quiet effect height of full juice filtration method, purity can improve more than 0.60 after the full charge come-up is separated, and can improve 20～30% with clear the spending of syrup of secondary floating method than filtration method, and decolorization is arranged. In addition, because the saturated with syrup filtration difficulty, (52～58Bx) syrup then can be brought up to 60～65Bx with syrup degree of hammer into shape with floating method, like this, can save and boil sugared steam consumption generally can only to adopt low hammer degree. Carbonation returns molten slurry and adopts come-up partition method and every technology quality index that full juice filters to be compared as follows table:

The continuous table of going up

Annotate: percent of decolourization is total percent of decolourization of basic calculation with the colour of float for the second time rear decoloring colour and retro-dissolved syrup all.

Though adopt the scum silica frost of floating method to need to filter, but because the particle diameter of scum silica frost brings up to about 10 μ about by 1 μ that does not add before the flocculation agent, so the strainability of scum silica frost is good, it is part low that filter mud contains sugar, it is nearly about 30% to reduce loss than whole-juice filtering method, filters yield and can improve 3.35 times than whole-juice filtering.Carbonation returns molten slurry and relatively sees the following form with the equipment capacity of the scum silica frost filtration after floating with whole-juice filtering:

This shows that the whole-juice filtering method residues in water-fast impurity in the sugar and is higher than water-fast impurity 40% in the sugar of the partition method that floats.

It is easy and simple to handle that floating method of the present invention replaces full juice clarification process to have, and saves facility investment, saves labour (per hundred tons of sugared production remunerations can reduce 80～100 yuan), and cost is low.The advantage that yield is high, and than the syrup decolorization rate of whole-juice filtering, clear degree, sugar hammer degree height can guarantee white sugar quality like this, sugared steam consumption is boiled in saving, has improved 2～3 times of equipment capacities.

Embodiment:

With the peace and quiet raw sugar of sulfitation process craft (pol 96, moisture content 1%, reducing sugar 0.5%, ash 0.5%, 100 tons of colours (4000ICUMSA) earlier add 55m behind whizzer honey wash-out look ³Water gets retro-dissolved syrup, and its hammer degree height is 65Bx, pH6.5, colour 2000ICUMSA.Be heated to 80 ℃～85 ℃, after add the about 10m of milk of lime of 8Be ' ³, through the stack gas full charge of washing, residual alkali number is higher than 300 milligrams/liter, adds phosphoric acid (P again ₂O ₅) transfer about 10kg the residual alkali of PH to 8.5 control about 200 milliliters/liter, after getting blisters, mechanical bubbler adds polyacrylamide 1.5kg, behind mixing tank, in the come-up device, leave standstill 30 minutes come-ups, scum silica frost scrapes off with the scraper plate device and is sent to the pressure filter filtration, middle layer clean plasm and scum silica frost filtrate merge 99 tons of clear syrup, be 1131 through the colour after the secondary come-up syrup purificationization, percent of decolourization is 50.99%, letter purity 97.34%, clear degree is 33.34CM.

Claims

1, a kind of through carbonation, the retro-dissolved syrup clarification process after the heating is characterized in that in retro-dissolved syrup adding the flocculation agent of 10-20 milligram/kilogram Bx.And the phosphoric acid of 20-100 milligram/kilogram Bx, the retro-dissolved syrup that pH value 8.0-9.0 temperature is 75～90 ℃ separates scum silica frost through the come-up device, replaces whole-juice filtering with floating method.

2, retro-dissolved syrup clarification process according to claim 1 is characterized in that flocculation agent is a polyacrylamide.