CN101693907A

CN101693907A - Method for using dried potato flour to prepare potassium citrate

Info

Publication number: CN101693907A
Application number: CN200910309353A
Authority: CN
Inventors: 黄果成
Original assignee: Hunan Dongting Citric Acid Chemicals Co Ltd
Current assignee: Hunan Dongting Citric Acid Chemicals Co Ltd
Priority date: 2009-11-06
Filing date: 2009-11-06
Publication date: 2010-04-14

Abstract

The invention discloses a method for using dried potato flour to prepare potassium citrate, comprising the following steps of grinding dried sweet potatoes or tapioca chips into 60 to 80 class, making into a pasty mixture according to a proportion of 1: 4 to 5 of flour and water, pumping the mixture into a fermentation tank, adding amylase and ammonium sulphate into the fermentation tank, liquefying the starch by rising temperature, lowering the temperature to 39 degrees after sterilization and disinfection, adding aspergillus niger that is a fermenting culture of citric acid to implement fermentation for 55 to 60 hours, heating the mixture to 70 to 80 degrees, getting fermentation liquor containing citric acid through separation, adding the aspergillus niger into the fermentation tank to implement fermentation after liquidation, sterilization and disinfection through rising temperature, and using the fermented fermentation liquor containing citric acid to prepare calcium citrate by a method of 'calcium salts' and further to prepare potassium citrate through adding potassium carbonate. Compared with the method for preparing potassium citrate through the reaction of finished citric acid and potassium hydrate, the invention directly extracts potassium citrate from the fermentation liquor, has the advantages of low production cost, high economic profit, short flow of production, less production waste and less environmental pollution, and can reduce the production cost by 20 to 30 percent.

Description

A kind of method of producing Tripotassium Citrate by potato dry powder

Technical field

The present invention relates to a kind ofly utilize agricultural-food dried sweet potato or cassava to do to be the method for feedstock production Tripotassium Citrate.

Background technology

Preparing the method that Tripotassium Citrate usually adopts is: potato do → pulverizes → sizes mixing → ferment → squeeze → neutralize → acidolysis → from friendship → concentrated → crystallization → drying, produce citric acid, be the simple neutralization reaction of prepared using with citric acid and potassium hydroxide or salt of wormwood again, through neutralization → decolouring → removal of impurities → concentrate → explained hereafter Tripotassium Citrates such as crystallization → drying.The technical process of this kind method is long, and environmental pollution is bigger, and waste is too much, and in addition, production cost is too high, no actual production meaning.

Summary of the invention

The object of the present invention is to provide a kind of product cost low, technical process is short, the operation canalization, and waste is few in the production process, the method by potato dry powder production Tripotassium Citrate that environmental pollution is little.

The objective of the invention is to be achieved through the following technical solutions: a kind of method of producing Tripotassium Citrate by potato dry powder, it is characterized in that: after comprising the steps: dried sweet potato or cassava dry grinding to 60～80 orders that (1) is not mouldy with drying, with the potato powder: water is 1: after (4～5) are deployed into pasty state, to fermentor tank, adding the amylase of 10～20 units and potato dry powder weight ratio by every gram potato dry powder in fermentor tank is 0.01%～0.05% to add ammonium sulfate with pump delivery; (2) after intensification makes potato dry powder starch liquefacation, continue to be cooled to 39 ℃ behind the intensification sterilization and disinfection, add citric acid fermentation bacterial classification aspergillus niger, fermented about 55～60 hours; (3), isolate the fermented liquid that must contain citric acid behind the dried slag thing of potato by pressure filter with behind mixture heating up to 70～80 ℃; (4) fermented liquid that contains citric acid is warming up to 80～85 ℃ in neutralization tank, do neutralization reaction promotor by calcium chloride solution and 0.05 kilogram of solid Whitfield's ointment of adding 5 liter 32% in every cubic metre of fermented liquid, and slowly add lime carbonate, normal pressure reacted 20～30 minutes down, and control terminal point pH value is about 5.5; (5) neutralization the is finished citrate of lime mixture of back gained filters, and with 80～90 ℃ hot wash citrate of lime, washes the residual sugar in the most citrate of lime; (6) salt of wormwood is made into 20% solution, put into the liquid level of retort to 50%, start and stir and be heated to about 60 ℃, slowly drop into citrate of lime to PH be 10～10.5, be heated to 85 ℃ and keep 30 minutes after, filtering separation and with after the hot wash, merging filtrate and washing lotion are potassium citrate solution; (7) with the potassium citrate solution deironing, remove look, again through multiple filter and smart filter, remove trace impurity remaining in the solution, condensing crystal gets the xln Tripotassium Citrate, centrifugation then, drying obtain the Tripotassium Citrate crystal.

The present invention is one step extraction Tripotassium Citrate product from fermented liquid directly, produces Tripotassium Citrate with finished lemon acid and potassium hydroxide reaction and compares, and production cost is low, the economic benefit height can reduce cost 20%～30%, and Production Flow Chart is short, the production waste is few, and is low in the pollution of the environment.

Embodiment

The invention will be further described according to specific embodiment below:

(1) behind the dried sweet potato or cassava dry grinding to 60～80 orders that drying is not mouldy, with the potato powder: water is 1: after (4～5) are deployed into pasty state, to fermentor tank, add fermentation accelerant with pump delivery according to the ratio that adds 20 milliliters and 0.6 kilogram ammonium sulfate of 20000 unit liquid starchy enzymes per ton; (2) be warming up to 85 ℃ after, be incubated 30 minutes, treat potato dry powder starch liquefacation after, continue to be warming up to 105 ℃ and kept 15 minutes, be cooled to 39 ℃ behind the sterilization and disinfection after, add citric acid fermentation bacterial classification aspergillus niger, fermented about 55～60 hours, and made and contain 10%～15% citric acid and the dried slag mixture of potato.(3) with behind mixture heating up to 70～80 ℃, be transported to plate-and-frame filter press fast, isolate the fermented liquid that the dried slag of potato contains citric acid with slush pump.(4) after the fermented liquid that will contain citric acid is squeezed into neutralization tank with acid proof pump by pipeline, be warming up to 80～85 ℃, adding 5 liters in every cubic metre of acid solution has been made into calcium chloride solution and 0.05 kilogram of solid Whitfield's ointment of 32% and has done neutralization reaction promotor, and slowly add lime carbonate, normal pressure reacted 20～30 minutes down, and control terminal point pH value is about 5.5.(5) neutralization being finished afterwards, the citrate of lime mixture of gained filters by the adhesive tape type filter, and with 80～90 ℃ hot wash citrate of lime, wash the residual sugar in the most citrate of lime, and with 0.1% potassium permanganate solution check, do not disappear for qualified with redness in 5 minutes.(6) food grade salt of wormwood is made into 20% solution, puts into the liquid level of retort to 50%, start to stir also and be heated to about 60 ℃, slowly dropping into qualified citrate of lime, to transfer to PH be more than 10～10.5 post-heating to 85 ℃, and kept 30 minutes; After reaction is finished, isolate lime carbonate with the adhesive tape type filter while hot, after hot wash, merging filtrate and washing lotion are potassium citrate solution.(7) potassium citrate solution is sent in the deferrization bucket, start stirring, be warming up to 75 ℃, slowly feed hydrogen sulfide, and note ventilation, prevent to poison, after treating that iron ion content is less than 10PPM in every ml soln, stop ventilation, and add 1%～2% gac, remove the foreign pigment in the solution, refilter the active breeze of removing in the solution; It is 6.5～6.8 that the solution of removing breeze is adjusted to PH with 7%～8% citric acid, through multiple filter and smart filter, removes trace impurity remaining in the solution again; Filtrate gets the xln Tripotassium Citrate through economic benefits and social benefits or the crystallization of multiple-effect concentration tank concentrating under reduced pressure, the centrifugation Tripotassium Citrate crystal that must wet then, and water flush away surface mother liquor, drying is sloughed surperficial moisture content and is obtained the Tripotassium Citrate crystal.

Claims

1. a method of producing Tripotassium Citrate by potato dry powder is characterized in that: comprise the steps:

(1) behind the dried sweet potato or cassava dry grinding to 60～80 orders that drying is not mouldy, with the potato powder: water is 1: after (4～5) are deployed into pasty state, to fermentor tank, adding the amylase of 10～20 units and potato dry powder weight ratio by every gram potato dry powder in fermentor tank is 0.01%～0.05% to add ammonium sulfate with pump delivery;

(2) after intensification makes potato dry powder starch liquefacation, continue to be cooled to 39 ℃ behind the intensification sterilization and disinfection, add citric acid fermentation bacterial classification aspergillus niger, fermented about 55～60 hours;

(3), isolate the fermented liquid that must contain citric acid behind the dried slag thing of potato by pressure filter with behind mixture heating up to 70～80 ℃;

(4) fermented liquid that contains citric acid is warming up to 80～85 ℃ in neutralization tank, do neutralization reaction promotor by calcium chloride solution and 0.05 kilogram of solid Whitfield's ointment of adding 5 liter 32% in every cubic metre of fermented liquid, and slowly add lime carbonate, normal pressure reacted 20～30 minutes down, and control terminal point pH value is about 5.5;

(5) neutralization the is finished citrate of lime mixture of back gained filters, and with 80～90 ℃ hot wash citrate of lime, washes the residual sugar in the most citrate of lime;

(6) salt of wormwood is made into 20% solution, put into the liquid level of retort to 50%, start and stir and be heated to about 60 ℃, slowly drop into citrate of lime to PH be 10～10.5, be heated to 85 ℃ and keep 30 minutes after, filtering separation and with after the hot wash, merging filtrate and washing lotion are potassium citrate solution;

(7) with the potassium citrate solution deironing, remove look, again through multiple filter and smart filter, remove trace impurity remaining in the solution, condensing crystal gets the xln Tripotassium Citrate, centrifugation then, drying obtain the Tripotassium Citrate crystal.