RU2239659C1 - Method for preparing sugar from crude sugar in beet-sugar plant - Google Patents

Abstract

FIELD: sugar industry.

SUBSTANCE: invention relates to processing crude sugar in beet-sugar plants. Method involves preparing crude sugar clarification. Sugar massecuite with crystallization I is boiled down and centrifuged with removed fractions from the first and the second backflow. Mixture including clarification and 60-80% of the first backflow of indicated sugar massecuite is prepared and sugar massecuite of crystallization II from remained amount of the first backflow is boiled down and centrifuged it with removed fraction of the first backflow. Sugar massecuite of crystallization III is boiled down that is centrifuged with removing yellow sugar and molasses. Prepared yellow sugar is subjected for affinity process by backflowing sugar massecuite of crystallization II. Affinity sugar massecuite is centrifuged for separation of sugar-refining from affine backflow and this sugar is washed out. Sugar-refining is clarificated in common with yellow sugar of sugar massecuite of crystallization II. Clarification is subjected for sulfitation and fed to boiling down sugar massecuite of crystallization I and affinity backflow is fed to boiling down sugar massecuite of crystallization III. Invention reduces lime consumption for treatment of clarification, reducing sugar loss in molasses and elevating yield of ready production.

EFFECT: improved preparing method.

1 tbl, 1 ex

Description

The invention relates to the processing of raw sugar in sugar beet factories.

There is a method of producing sugar from raw sugar in sugar beet factories [Instructions for maintaining the technological processes of acceptance, storage and processing of raw sugar in beet sugar factories. M .: Sakhinform LLP, 1994, 88 pp.], Including curing of raw sugar, defecaturation purification of a mixture of raw sugar tartings, yellow sugar of III crystallization and return of the first outflow of massecuite I crystallization in the amount of 60-80% to the total outflow , filtering, sulfation of the general clearing and boiling massecuite according to two-, three-crystallization schemes.

The disadvantages of this method are the increased consumption of lime - 5-6%, an increase in the number of non-sugars on the verst of the sugar factory due to the return to defecosaturation of the yellow sugar sugar III crystallization and, as a result, the accumulation of decomposition products of reducing substances, which are strong molasses and reduce the yield of finished products .

The technical result of the invention is to reduce the consumption of lime for cleaning clearing, to reduce losses of sugar in molasses and to increase the yield of finished products.

The technical result is achieved by the fact that in the proposed method for the production of sugar from raw sugar in a sugar beet factory, including the preparation of raw sugar curing, boiling massecuite I crystallization, centrifugation with the selection of the first and second outflows, preparation of a mixture of cLEURING and 60-80% of the first outflow said massecuite, boiling massecuite II crystallization from the remaining amount of the first outflow, centrifugation of massecuite II crystallization with the selection of one outflow, boiling massecuite III crystallization and its centrifuge yellow sugar and molasses, yellow massecuite sugar III crystallization is subjected to reflux by massecuite flow II crystallization, the resulting refueling massecuite is centrifuged to separate the refined sugar from the affinity flow and this sugar is washed, after which the sugar refined is glued together with yellow crystallization sugar II, this klerovka is sulphite and served for boiling massecuite I crystallization, while the affinity outflow is directed to boiling massecuite III crystallization.

A method of producing sugar from raw sugar in a sugar beet factory is as follows.

The preparation of raw sugar curing involves its dissolution to 53-56% CB, defecaturation purification with a consumption of lime 4-4.5% CaO, filtration, sulfitation, and filtration after sulfitation. The massecuite of crystallization I is boiled in a vacuum apparatus from a mixture of sulfitated graveling with a return of 60 - 80% of the first outflow of massecuite I of crystallization and the entire second outflow of massecuite I of crystallization. Centrifugation of the massecuite I is carried out with the selection of two outflows, 60-80% of the first outflow of the massecuite I crystallization is returned to defecosaturation. The massecuite II crystallization is boiled from the remainder of the first outflow of the massecuite I crystallization. Massecuite II crystallization is centrifuged “hot” with the selection of one outflow. Yellow sugar massecuite II crystallization is sent to the tinning apparatus. The massecuite III crystallization is boiled from the part of the outflow of the massecuite II and the reflux outflow, the massecuite is additionally crystallized in a crystallization unit with cooling and subsequent heating before centrifugation. Massecuite III crystallization is centrifuged with the selection of one outflow - molasses. Yellow massecuite III sugar is mixed in an affinator with massecuite II edema diluted to a mass fraction of solids (CB) of 74-76% to obtain an affinity massecuite with a 89-90% content of CB. Refill massecuite centrifuged. Sugar-refinade is washed with hot water by selection of the general outflow - reflux, which is sent to the collector in front of the vacuum apparatus and used for the last pumping when boiling massecuite III crystallization. Refined sugar is fed with a screw into the tinning apparatus, dissolving it together with yellow sugar, the obtained tinning without defecaturation purification is sent to sulfitation, where it is mixed with purified raw sugar tarting, and after sulfitation and filtration they are sent to boil massecuite I.

The method is illustrated by the following example.

Example

Massecuite I crystallization is boiled in vacuum apparatuses from sulphitated total clearing to CB 92%, with a purity of 94%. For pumping into the vacuum apparatus they take part of their second outflow with a purity of at least 90%. Massecuite I crystallization is centrifuged with the selection of two outflows: the first with a purity of not higher than 83%, the second - not higher than 91%. Part of the first outflow is diluted with water to approximately 55% CB and returned to defecation treatment. The remainder of the first outflow of massecuite I crystallization is used to boil massecuite II crystallization. Massecuite II crystallization is boiled down to CB 92.5%, and then centrifuged with the selection of one outflow with a purity of no higher than 75%. Yellow sugar II crystallization is sent for clerking. To boil massecuite III of crystallization up to 94% CB, part of the outflow of massecuite II of crystallization is taken and the affinity outflow is directed to the last swap. Before descent from the vacuum apparatus, the massecuite is rocked with diluted molasses, and then the intercrystal solution is further desugared by cooling the massecuite in a crystallization unit to 28 ° C for 150 hours. The purity of the massecuite before centrifugation should be no higher than 74%. In the last massecuite mixer, the massecuite is heated at 10 ° C and centrifuged to select one outflow - molasses with a purity of 50.4%. Yellow crystallization sugar III is mixed with the massecuite II edema, having a purity of 75%, a temperature of 50 ° C, diluted with water to SV 74%, to obtain an affinity massecuite with 90% SV content. The refill massecuite is centrifuged, while the refined sugar is washed with water in an amount of 1% by weight of the massecuite. Refined sugar is fed by a screw into the tinning apparatus, dissolving it together with yellow sugar II, the obtained tearing together with the tarting of yellow sugar II is sent without sulfate treatment to sulfitation. The general affinity edema is directed to the last swap when boiling massecuite III. The purification effect in this case is 51.8% pure.

The results characterizing the performance of the products obtained by the proposed method and the prototype are presented in the table (see the end of the description).

Compared with the prototype, the method for producing sugar from raw sugar in a sugar beet factory using yellow sugar III refining allows to reduce lime consumption for clearing the grains by 1-1.2% due to the fact that yellow sugar III clearing does not return for defecation cleaning.

In addition, this method will reduce the loss of sucrose in molasses by 0.2-0.4% and, accordingly, increase the yield of sugar due to the fact that the reducing substances (RV) contained in the yellow sugar film, together with the refining edema, are sent to the last pumping when boiling massecuite III crystallization and, thus, the PB are preserved from decomposition, bypassing defecosaturation purification. PB have the ability to reduce the solubility of sucrose, so the greater their mass fraction in molasses, the less it contains sucrose and lower purity.

Thus, the proposed method for the production of sugar from raw sugar in a beet-sugar factory makes it possible to reduce the consumption of lime for the purification of clearing, to reduce the loss of sugar in molasses and to increase the yield of finished products.

Claims (1)

A method for the production of sugar from raw sugar in a beet-sugar factory, which involves the preparation of raw sugar clearing, boiling massecuite I crystallization, its centrifugation with selection of the first and second outflow, preparation of a mixture of clearing and 60-80% of the first outflow of this massecuite, boiling massecuite II crystallization from the remaining amount of the first outflow, centrifugation of massecuite II crystallization with the selection of one outflow, boiling massecuite III crystallization and centrifugation with the removal of yellow sugar and molasses, distinguishing I mean that the yellow massecuite III sugar is subjected to reflux by the massecuite flow II of crystallization, the resulting affection massecuite is centrifuged to separate the refined sugar from the affection efflux, and this sugar is washed, after which the refined sugar is glued together with the yellow massecuite II crystallization sugar, this peeling is sulfonated and served on boiling massecuite I crystallization, while the affinity outflow is directed to boiling massecuite III crystallization.