SU1286631A1 - Method of producing refined milk sugar - Google Patents

Abstract

This invention relates to milk production and can be used in the production of refined milk sugar from raw milk sugar. The purpose of the invention is to increase the yield of milk sugar and reduce energy costs. The goal is achieved due to the fact that before dissolving the raw milk sugar, the fraction of large crystals with dimensions not less than 1.25 mm is separated, and the solution of only this fraction of large crystals is centrifugally cleaned. with

Description

This invention relates to the dairy industry and can be used in the production of refined milk sugar from raw milk sugar.

The aim of the invention is to increase the yield of milk sugar and reduce energy costs.

The method is carried out as follows. Raw milk sugar divided 10 4,46%, ash 5,80%. Syrup refined.

Example 1. Milk sugar raw in the amount of 1000 kg (with a lactose content of 94.5%, moisture 3.0%, protein 1.72%, ash 1.51%) is dissolved in 600 l of water at 90-95 ° C . After complete dissolution of the crystals, the solution is sent for separation and a protein precipitate is isolated in the amount of 11.02 kg with a lactose content of 71%. protein substances

2 fractions with a crystal size of more and less than 1.25 mm. The obtained fractions are dissolved separately at 90-95 ° C in 40-60 minutes to obtain a dry matter concentration of 60-65%. The solution of large-sized crystals is subjected to centrifugal cleaning at the separator. The purified solution and the crystal solution of the fine fraction are shifted and refining agents are introduced. After 15 minutes, the solution is filtered on a filter press and fed to crystallization, which lasts 10 hours. The lactose crystals are centrifuged and formed to a final moisture content of 0.7%.

The main protein content is in large crystals of raw lactose sugar. This is due to the ability of proteins to glue (combine) individual fine particles into clumps. Therefore, in large particles with sizes greater than 1.25 mm, the protein content is 85-90% of their total content in milk sugar raw. Due to this, there is no need to clean the centrifuge 15

filtered and sent for crystallization. After centrifuging the wet crystals to a final moisture content of 0.6%, the wet crystals receive 645 kg of refined lactic sugar with a lactose content of 99.1%, no protein substances, no ash of 0.122%. The power of the separator motor is 17 kW. With a separator capacity equal to

20 equal to 5000 l / h, 1600 l of raw milk sugar solution will be cleaned for 0.32 h. At a cost of 1 kW / h 0.025 rubles. Costs will be 0.136 rubles. Example 2. Milk, sugar-sy-; 1000 kg (with a lactose content of 94.5%, protein of 1.723%, ash of 1.51%) are divided into two fractions: a large one, with a size of 1.25 mm (protein content

 85% of the total amount) and small - up to 1.25 mm in size (protein content 15% of the total). 88 kg of coarse fraction crystals and 912 kg of small crystals are obtained.

35 fractions. The fractions obtained are dissolved

separately. After the complete dissolution process, all the raw sugar, and only the solution of the large fraction crystals in to its part, after dividing the amount of 135 liters, is sent to sepa- lactic and raw, into fractions. So rator. The weight of the sediment is 10.61 kg (the content of the raw sugar solution is lactose closure of 50.4%, protein vein fraction supplied to the separator, substances 12.343%, ash 18.955%). The purified solution is mixed with a solution of small fractions, refined, filtered and sent to crystallization. The wet crystals were centrifuged and dried to a final moisture content of 0.6%. 660 kg of refined milk sugar with a lactose content of 99.1% are obtained, there are no protein substances, and ash is 0.122%.

The loss of lactose with the precipitate of the separator is reduced and the yield of the final product increases.

Sediments for electricity with less than the total volume, the loss of lactose in the sediment ji is reduced, its output increases.

The percentage of coarse fractions (over 1.25 mm) ranges from 26.9% to 11.4%, depending on the quality of raw milk sugar. It is in these fractions that the bulk of the 50 protein substances are contained, which, during the dissolution process, go into a suspended state and are removed by separation. In fractions of 1.25 and higher, the protein content is 85-55 by pairing and was 0.0115 rubles. 90% of the total amount of protein weights. Example 3. Milk sugars contained in raw milk sugars in an amount of 1000 kg (with a 94.5% lactose content of lactose, protein content 5

filtered and sent for crystallization. After centrifuging the wet crystals to a final moisture content of 0.6%, the wet crystals receive 645 kg of refined lactic sugar with a lactose content of 99.1%, no protein substances, no ash of 0.122%. The power of the separator motor is 17 kW. With a separator productivity equal to 5000 l / h, 1600 l of raw milk sugar solution will be cleaned in 0.32 h. At a cost of 1 kW / h 0.025 rubles. The cost is 0.136 rubles. Example 2. Milk, sugar-sy-; 1000 kg (with a lactose content of 94.5%, protein of 1.723%, ash of 1.51%) are divided into two fractions: a large one, with a size of 1.25 mm (protein content

85% of the total amount) and small - up to 1.25 mm in size (protein content 15% of the total). 88 kg of coarse fraction crystals and 912 kg of small crystals are obtained.

5 fractions. The fractions obtained are dissolved

substances 1.723%, ashes 1-, 51%) are divided into two fractions: large - with a particle size of more than 1.2 mm (protein content 86% of the total) and small - with a particle size less than 1.2 mm (content protein substances 14% of the total). Get 134 kg of crystals of the coarse fraction and 866 kg of crystals of the small fraction. Each one of the fractions is dissolved separately and a solution of 200 l of crystals of the large fraction is sent to a separator. Draft weight 11.0 kg (lactose content 66%, protein

substances 6.43%, ash 7.40%). Purified 15 ration, difficult, increases

the solution is mixed with a solution of the fine fraction, refined, filtered, crystallized. Wet crystals are separated by centrifugation and from: calat to a final moisture content of 0.6%. 650 kg of refined milk sugar with a lactose content of 99.1% are obtained, there are no protein substances, and ash is 0.122%.

By reducing the limiting value of the size of the separated crystals, the loss of lactose with the precipitate increases, and the quality of the finished product does not practically change. The cost of electricity during the separation amounted to 0.018 rubles. which is higher than with the optimal boundary size of the separated crystals.

Example 4. Milk sugar raw in the amount of 1000 kg (with a lactose content of 94.5%, protein substances 1.723%, ash 1.51%) is divided into two fractions: coarse — with a particle size of over 1.3 mm (protein content). substances 74% of the total) and small - with a particle size of up to 40 1.3 mm (protein content of 26% of the total). 58 kg of crystals of a large fraction and 942 kg of crystals of a small fraction are obtained. Each of the fractions is dissolved separately, and a solution of a large fraction of crystals in an amount of 90 liters is sent to a separator. A precipitate of 10.5 kg is obtained with a lactose content of 50%, protein substances of 12.570%, and ash of 17.332%. The purified solution is mixed with the solution.

the decomposition of lactose, which affects the output of the finished product. As can be seen from the above example, the size of the crystals of milk sugar

The 20 raw materials constituting the large crystal fraction should be at least 1.25 mm.

The proposed method allows to reduce the loss of lactose with sediment and

25 to increase the yield of refined milk sugar from 1 ton of syrup sugar by 10-15 kg.

Additional savings arise due to the fact that the volume of separableog

30 of the solution decreases, so the energy costs for separation also decrease.

35

Claims (1)

Invention Formula A method of producing refined milk sugar, including dissolving raw sugar, separating the solution to separate the proteins, refining, filtering, crystallizing, separating the crystals from the melasse and drying them, in order to increase the yield of milk sugar and reduce energy the fraction of large crystals with an average size of not less than 1.25 mm is allocated from the raw milk sugar crystals, and the dissolution of each of the fractions is carried out separately; above crystals. fine fraction, refined, filtered and sent to crystallization. The wet crystals are separated by centrifugation and dried to a final moisture content of 0.6%. Get 645 kg of refined milk sugar with a lactose content of 99.0%, no protein, ash 0.144%. Thus, with an increase in the limiting size of the size of the separated crystals, the protein substances are transferred to a fraction of small crystals that are not subjected to centrifugal cleaning. As a result, the process of filtering lactose, which affects the yield of the finished product. As can be seen from the above examples, the size of the milk sugar crystals constituting the fraction of large crystals must be at least 1.25 mm. The proposed method allows to reduce the loss of lactose with sediment and to increase the yield of refined milk sugar from 1 ton of sugar-syphin by 10-15 kg. Additional savings arise due to the fact that the volume of the separated the solution decreases, so the energy costs for separation also decrease. Invention Formula Method for the production of refined milk sugar, including dissolving raw sugar, separation of the solution for separation of proteins, refining, filtration, crystallization, separation of crystals from molasses and their drying, characterized in that, in order to increase the yield of milk sugar and reduce energy costs, from crystals the initial milk sugar contains a fraction of large crystals with an average size of not less than 1.25 mm, and the dissolution of each of the fractions is carried out separately, while the solution is sent for separation fractions of large crystals.