Usage of  Potassium Citrate

White crystal or powder; odourless; taste salty; slightly deliquescence; readily soluble in water or glycerine, almost insoluble in ethanol (Relative density 1.98, it will melt and decompose when heated to 230ºC) .
 In food processing industry,it is used as buffer agent ,chelate agent, stabilizer, antibiotic oxidizer, emulsifier, flavor
regluator, used in dairy product, jellies, jam, meat, tinned pastry. 
Used as emulsifier in cheese and used in citrus freshening.
In pharmaceutical, it is used for curing hypokalimia, potassium depletion and alkalization of urine.

In recent ten years,We are constantly pursuing good service of supplying high quality of the product and  competitive price.Our customers come from USA,India,Pakistan,Malaysia  and some African countries.We have accumulated much import and export experience.
With our continuous efforts,we can provide the following series of certificates.If you have other needs, please let us know.

 

25kgs/PP PE bag/Kraft bag/Carton
25MT in  20' FCL

Tianjin Hwashin Biotechnology Co., Ltd is located in the Tianjin Jinbin industrial park, which is 30km to Beijing Daxing International Airport, 70km to Tianjin Binhai International Airport, and 100km to the Xingang port.
Since 2004, We have devoted ourselves to the research & development, production and sales of food additives, feed additives products. Currently, we have 4 business departments: Food Additives department, Feed additives department, Cosmetics materials department, Industrial and Daily Chemicals department. We have 4 productions bases in Tianjin, Hebei provice, Shandong provice and Jiangsu provice. Besides, we worked with the leading Chinese biotechnical and chemical producers, we offer more than 200 products to over 10 countries in the world. 
Hwashin team have excellent knowledge of biotechnology, chemicals and international business. Relied on a strict quality control system, through years of continuous technical innovation, the company could provide customers with first-class products and services.

1.To supply high-quality products with reasonable prices in food  additive industry.
2.Research on the Market Knowledge & trend follow up and inform customers of price trends in the market timely.Timely Deliver & Stock Promotion on hot demanding products.
3.To follow orders and arrange shipping in time, providing complete documents for Customs clearance according to different export policies in different countries.
4.Reliable & Strictly follow the contract responsibility & after sales service
5.Professional on International Logistic Service, Legalization documents & Third Party Inspection process.

Our Aim is that the goods reach the customers quickly and safely.

With the spread of the epidemic abroad,the shipping market has been greatly affected.
Nomally, most suppliers can't rent a boat and book a space.
However,it not difficult for us to solve the problem.
We have joined the local freight forwarding alliance.
It help us to get the accurate shipping information and solve the shipping problem.
And then we can help customers to make accurate decisions.

1. What are your payment terms?
Usually L/C,D/P,T/T, western union, moneygram or paypal.

2.How can we guarantee quality?
Always a pre-production sample before mass production;
Always final Inspection before shipment;

3. What's your delivery time?
lt depends on order quantity, usually we will arrange shipment within 3-20 days.

4.When can I get reply?
our sales manager will contact you within 12 hours.

5. How about the validity of products?
According to the products you order, usually 2 years.

6. What documents do you provide?
Usually, we provide Commercial nvoice, Packing List, Bill of Loading and OriginCertificate,etc.
lf there are any special requirements in your market, please let us know.

7. Can l get sample before order?
Yes, we can provide free sample once price is agreed, and you have to pay us the delivery fee in advance.If place following order after geting free sample, we will refund the shipping cost of free sample.

8.How to start orders or make payments?
A: You can send us your Purchase order, or just send a simple confirmation by email or by Trade Manager, after communication then we will send you Proforma Invoice with our bank details for final confirmation, then you can make payment accordingly.
 

There are three production methods of citric acid: fruit chemical synthesis and biological fermentation.

Fruit extraction method refers to the extraction of citric acid from fruits with high citric acid content such as lemon, orange and apple. This method has high extraction cost and is not conducive to industrial production.

The raw materials of chemical synthesis method are acetone, dichloroacetone or vinyl ketone. This method has the advantages of complex process, high cost and low safety.

The fermentation method has the advantages of short fermentation cycle, high yield, labor saving, small floor area, convenient instrument control and continuity. It has become the main method of citric acid production.

Production process

1.strain culture

Add 25% to 30% agar into the wort with 4 ~ 6 Baume degrees, then add Aspergillus niger species (bacteria free operation), and culture at 30 ~ 32 ºC for about 4 days. This culture method is called "inclined culture". Mix bran and water in the ratio of 1:1, add 10% calcium carbonate and 0.5% ammonium sulfate, mix well, put them into a 250ml triangular flask, and sterilize with 1.5kg pressure for 60 minutes. The strain cultured by the inclined plane culture method can be used after 96 ~ 120 hours of culture.

2. raw material treatment

Wet powder slag must be pressed and dehydrated to make the water content about 60%; The water content of dry powder slag is low, and the water shall be supplemented according to the proportion of 60%; The agglomerated powder slag needs to be crushed into two to four mm particles. Then add 2% calcium carbonate and 10% to 11% rice bran, mix well, stack for 2 hours, and then cook. Pressure steaming and atmospheric steaming can be used for cooking. It is better to use rotary steamer for pressurized steaming materials, and fixed steamer or fixed cement steamer can be used for atmospheric steaming materials. First, use the bran raising machine to break the cooked material, and then add boiling water containing anti pollution drugs.

3. inoculation and fermentation

When the phosphorus temperature is cooled to 37 ~ 40 ºC, connect the strain suspension. After inoculation, it shall be sent to the fermentation chamber (at this time, the material temperature shall not be lower than 27 ºC). The production process must be strictly aseptic. The fermentation room shall be disinfected and fumigated with formaldehyde or sulfur regularly. It is best to use 10ml / m3 of formaldehyde and 25g / m3 of sulfur.

4. control of fermentation process conditions

(1) The fermentation process was not solved. Pay attention to proper ventilation, because Aspergillus niger is an air loving bacterium.

(2) The relative humidity in the fermentation room should be kept between 86% and 90%.

(3) Pay attention to temperature control during fermentation. The whole fermentation process is divided into three stages: the first stage is the first 18 hours, the room temperature is between 27 ~ 30 ºC and the feed temperature is about 27 ~ 35 ºC; The second stage is 18 ~ 60 hours, the feed temperature is 40 ~ 43 ºC, which can not exceed 44 ºC, and the room temperature is about 33 ºC; The third stage is 60 hours, the feed temperature is about 35 ~ 37 ºC and the room temperature is 30 ~ 32 ºC


5. leaching citric acid

Put the Qu material into the leaching cylinder and soak it for five times with water at a temperature of more than 90 ºC for about 1 hour each time. When the acidity of the leaching solution is lower than 0.5%, stop soaking for slag discharge. Pour the immersion solution into the enamel, heat it to above 95 ºC, keep it for 10 minutes, stop heating, and let it stand and precipitate for 6 hours.

6. clear liquid neutralization

Transfer the precipitated clear liquid into the neutralization tank, heat it to 60 ºC, add calcium carbonate for neutralization, and stir while adding. Citric acid and calcium carbonate form insoluble calcium citrate, which is separated and precipitated from the fermentation broth to separate from other soluble impurities. After adding calcium carbonate, raise the temperature to 90 ºC and keep it for half an hour. After the calcium carbonate reaction is completed, pour it into the sedimentation tank, remove the residual acid, put it into a centrifuge for dehydration, and wash the calcium salt with hot water above 95 ºC to remove the impurities and sugar attached to its surface. Here, we should focus on checking whether the sugar is washed (the washed calcium citrate should be acidolysis quickly, and should not be stored for too long, otherwise it will cause losses due to mildew and deterioration. If it cannot be handled in time for some reason, it shall be dried and then stored). The method is to drop 1 ~ 2% potassium permanganate solution into 20ml washing water, and the sugar has been basically cleaned if it does not change color for 3 minutes.

In the process of clear liquid neutralization, it is very important to control the end point of neutralization. Excessive calcium carbonate will cause colloids and other impurities to precipitate together, which will not only affect the quality of calcium citrate, but also cause difficulties in the subsequent process. Generally, calcium carbonate is added according to the calculated amount (total calcium carbonate = total citric acid) × 0.714), the end point is reached when the pH is 6.5 ~ 7.0 and the titrated residual acid is 0.1 ~ 0.2%. Once the amount of calcium carbonate is added, it is necessary to add additional fermentation or mother liquor.

7. acidolysis and decolorization

Acidolysis is the reaction of washed insoluble calcium citrate with martyrs to produce citric acid and calcium sulfate. The reaction formula is as follows:

Ca(C6H5O7)2+3H2SO4=2C6H8O7+3CaSO4

The specific operation is to dilute calcium citrate into a paste with water, slowly add sulfuric acid (generally calculate the amount of sulfuric acid according to the amount of calcium carbonate, preferably 92 ~ 95% of the amount of calcium carbonate), and start the determination of the end point after adding 80% of the calculated amount. The measurement method is as follows: take two test tubes, tube a absorbs 1ml of 20% sulfuric acid and tube B absorbs 1ml of 20% calcium chloride. Add 1ml of filtered acidolysis solution respectively, heat it in the water bath to boil, and observe the two solutions after cooling. If there is no turbidity, add 1ml of 95% alcohol respectively. If there is no turbidity in tube a and tube B, it is considered to have reached the end point. Turbidity in the nail tube indicates that the dosage of sulfuric acid is insufficient, and some calcium citrate should be added. After the acidolysis reaches the end point, boil for 30 ~ 45 minutes, and then put it into the filter tank for filtration.

In the obtained clear solution, add activated carbon (generally 1 ~ 3% citric acid, depending on the color of the acidolysis solution) for decolorization, keep it at about 85 ºC for 30 minutes, and then filter. Wash the filter bottle with hot water above 85 ºC until the residual acid is less than 0.3 ~ 0.5%. Store the washing water separately as the bottom water for the next acidolysis.

8. concentration and crystallization

The clear liquid obtained by filtration after decolorization is concentrated by reduced pressure method (the vacuum degree is required to be 600 ~ 740 mmHg and the temperature is 50 ~ 60 ºC). After citric acid solution is concentrated, it is highly corrosive. Therefore, enamel lined concentration pots are mostly used. The concentration of concentrated solution shall be appropriate. If the concentration is too high, powder will be formed; However, if the concentration is too low, it will also cause less crystal nuclei, large particles and small quantity of finished products, and a large amount of unreported citric acid will remain in the mother liquor, affecting the output. When the concentration reaches 36.7 ~ 37 Baume degrees, it can be discharged from the tank. After citric acid crystallizes, the mother liquor is removed by centrifuge, then the crystal is washed with cold water, and finally the water on the crystal surface is removed by drying oven. The mother liquor can be crystallized again directly. The remaining mother liquor often contains a lot of impurities, so it is not suitable for the third crystallization, but it can be applied in the acidolysis solution or re neutralized with calcium carbonate. The temperature of the drying oven shall be controlled below 35 ºC. If the temperature is higher than 20 ºC, normal temperature airflow drying can be adopted.