CN107602730B

CN107602730B - Secondary extraction process of konjac glucomannan

Info

Publication number: CN107602730B
Application number: CN201710906174.8A
Authority: CN
Inventors: 钟品良
Original assignee: Yichang Weite Konjac Glucomannan Co ltd
Current assignee: Yichang Weite Konjac Glucomannan Co ltd
Priority date: 2017-09-29
Filing date: 2017-09-29
Publication date: 2020-09-25
Anticipated expiration: 2037-09-29
Also published as: CN107602730A

Abstract

The invention discloses a secondary extraction process of konjac glucomannan, which comprises the following steps of soaking and swelling konjac flour by ethanol, grinding and refining by a pulping machine, performing solid-liquid separation by a centrifuge, and drying at low temperature to obtain finished konjac flour, wherein the solid-liquid separation by the centrifuge further comprises secondary filtration of waste liquid by a high-pressure filter, so that the yield of the konjac glucomannan is improved, the ethanol recovery and waste liquid standard discharge cost is reduced, and the economic benefit of an enterprise is increased.

Description

Secondary extraction process of konjac glucomannan

Technical Field

The invention belongs to the field of food processing, and particularly relates to a secondary extraction process of konjac glucomannan.

Background

Konjak glucomannan is an effective component extracted from konjak. Calculated on a dry basis, the glucomannan in the konjak is more than 50 percent; rhizoma Amorphophalli also contains other components such as protein, dietary fiber, starch, free reducing sugar, amino acids, etc.; meanwhile, the fertilizer contains a small amount of harmful substances such as alkaloid, arsenic, sulfur dioxide and the like.

Konjac glucomannan has various unique physicochemical properties, such as high viscosity, stability, emulsibility, high expansibility, film forming property, gelation property and specific bioactivity of hydrosol, so that the konjac glucomannan can be widely applied to the fields of food, medicine, chemical industry, daily chemicals, papermaking, textile, petroleum, environmental protection and the like.

At present, the production process commonly adopted in the konjak industry, namely a one-time extraction method, has the defects of low product yield and resource waste.

The extraction of konjac glucomannan generally adopts the process routes of ethanol soaking and swelling, pulping machine grinding and refining, solid-liquid separation by a centrifuge and low-temperature drying, namely a one-time extraction method, to purify the konjac glucomannan from konjac flour, and the auxiliary process also comprises the following steps: (1) and in the ethanol recovery process, the separated ethanol waste liquid is distilled and recovered by an ethanol recoverer, and the recovered ethanol is recycled. (2) The waste water innocent treatment process has the advantages that the waste water after ethanol recovery contains more harmful substances, can not be directly discharged, and needs to be subjected to innocent treatment to reach the standard and be discharged.

The process flow of the primary extraction method is as follows:

the extraction process comprises the following steps: konjak powder → ethanol soaking → refining → solid-liquid separation → drying → finished product.

An auxiliary process comprises the following steps: and (3) ethanol recovery process, namely distillation recovery.

An auxiliary process comprises the following steps: environmental protection process, and harmless treatment of wastewater.

The konjac glucomannan refined by grinding has high viscosity, and the fine glucose particles and part of impurities are mixed together, so that the difficulty of solid-liquid separation and waste liquid recovery is determined.

In the prior art, a filter screen with more than 200 meshes is generally used for separation, even a part of factories use 100-mesh large-aperture mesh cloth for solid-liquid separation, the mesh is a collected product, but more fine micro-sugar particles (accounting for more than 8 percent of dry basis) escape under the mesh, and the part is used as dregs to enter the next working procedure to be discarded, so that the yield of konjac glucomannan is low, and the production cost of the product is increased.

The viscosity of the swelled fine sugar particles is high, and the difficulty of recovering the ethanol waste liquid is increased, so that the power cost of the fuel is directly increased. In the wastewater after ethanol recovery, because of containing sugar particles and other impurities, the harmless treatment before discharge is difficult, the efficiency is low, and the cost is increased.

The research on the new process and the equipment matching for extracting the konjac glucomannan improves the yield of the konjac glucomannan, reduces the cost of ethanol recovery and standard discharge of waste liquid, increases the economic benefit of enterprises, and is an important subject generally faced by konjac processing enterprises.

The method combines the current situation of the extraction process of glucomannan of manufacturers at home and abroad and the experience of production tests for many years, provides a new secondary extraction process of waste liquid, and overcomes the industrial problem.

Disclosure of Invention

Aiming at the defects in the prior art, the invention provides a novel secondary extraction process of waste liquid, which is used for recovering glucomannan particles in the waste liquid.

The invention is realized by the following scheme:

a process for extracting konjak glucomannan twice includes such steps as immersing konjak flour in alcohol, swelling, grinding, centrifugal separation, low-temp drying to obtain konjak flour, and solid-liquid separation by centrifugal separator:

a. waste liquid generated by solid-liquid separation of a centrifuge and 30-50% volume concentration ethanol solution are mixed according to the proportion of 1: 1, fully mixing and standing for 1-2 h to form fully-swelled pretreatment liquid;

b. filtering the pretreatment solution for 1-3h by using a 400-mesh and 1000-mesh filter screen under 12-18 standard atmospheric pressures to obtain a konjac glucomannan crude product and a secondary waste liquid;

c. c, drying the konjac glucomannan crude product obtained in the step b at a low temperature to obtain a finished product of konjac powder;

d. and c, fractionating and purifying the secondary waste liquid obtained in the step b, diluting the obtained ethanol, and recycling.

Adopt the high pressure filtration appearance to filter in above-mentioned step b, the high pressure filtration appearance includes the support, has the extrusion passageway on the support, the passageway both ends communicate with feed valve and bleeder valve respectively, the passageway top sets up fixed apron, the passageway bottom sets up anti high pressure filter, anti high pressure filter inner wall sets up 400 + 1000 mesh filter screens, the passageway both sides set up the movable clamp plate, a plurality of pneumatic cylinders that set up side by side symmetry are connected to the clamp plate outside, all pneumatic cylinders are all connected on the pump station, be provided with manometer and pressure regulating valve on the pump station, extrusion passageway below is connected with the drainage passageway.

The invention has the beneficial effects that: the yield of konjac glucomannan is improved by about 8 percent compared with the extraction efficiency of a one-time extraction process, the ethanol recovery and waste liquid standard discharge cost is reduced, and the economic benefit of an enterprise is increased.

Drawings

FIG. 1 is a schematic top view of a high pressure filtration apparatus according to the present invention.

FIG. 2 is a schematic sectional view of the extrusion channel of the high pressure filtration apparatus of the present invention.

The reference numbers are as follows:

1. a support; 2. a channel; 3. a feed valve; 4. a discharge valve; 5. a cover plate; 6. a high pressure resistant filter plate; 7. filtering with a screen; 8. pressing a plate; 9. a hydraulic cylinder; 10. drainage channel

Detailed Description

In order to make the technical means, the original characteristics, the achieved purposes and the effects of the invention easy to understand, the invention is further explained by combining the specific embodiments and the drawings.

Adopt the high pressure filter appearance to filter in above-mentioned step b, the high pressure filter appearance includes support 1, extrusion passageway 2 has on the support 1, 2 both ends of passageway communicate with feed valve 3 and bleeder valve 4 respectively, 2 tops of passageway set up fixed

apron

5, 2 bottoms of passageway set up anti high pressure filter 6, anti high pressure filter 6 inner wall sets up 400 and gives other 1000 mesh filter screens 7, 2 both sides of passageway set up movable clamp plate 8, a plurality of pneumatic cylinders 9 that set up side by side symmetry are connected to the clamp plate 8 outside, all pneumatic cylinders 9 all connect on the pump station, be provided with manometer and pressure regulating valve on the pump station, extrusion passageway below is connected with drainage channel 10.

When the device is used, waste liquid generated by solid-liquid separation of the centrifuge is swelled by ethanol, the pretreatment liquid is added into the extrusion channel through the feeding valve, the feeding valve and the discharge valve are closed, the pump station is started, the pressure of the material to be extruded is controlled to be 12-18 atmospheres, the hydraulic cylinder drives the pressing plate to extrude the pretreatment liquid, after the pressure is kept for 1-3 hours, filter residues are discharged from the discharge valve, and a finished product is obtained through low-temperature drying.

The above description is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiment, and all technical solutions belonging to the principle of the present invention belong to the protection scope of the present invention. Modifications to the disclosed embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention.

Claims

1. A process for extracting konjak glucomannan twice includes such steps as immersing konjak flour in alcohol, swelling, grinding, centrifugal separation, low-temp drying to obtain konjak flour, and solid-liquid separation by centrifugal separator:

b. filtering the pretreatment solution for 1-3h under 12-18 standard atmospheric pressures by using a high-pressure filter instrument to obtain a konjac glucomannan crude product and secondary waste liquid, wherein the high-pressure filter instrument adopts a 400-mesh filter screen with 1000 meshes; the high-pressure filter comprises a support (1), an extrusion channel (2) is arranged on the support (1), two ends of the channel (2) are respectively communicated with a feed valve (3) and a discharge valve (4), a fixed cover plate (5) is arranged at the top of the channel (2), a high-pressure resistant filter plate (6) is arranged at the bottom of the channel (2), a 400-plus-1000-mesh filter screen (7) is arranged on the inner wall of the channel (2), the filter screen (7) covers the whole channel (2), movable press plates (8) are arranged at two sides of the channel (2), a plurality of hydraulic cylinders (9) which are symmetrically arranged in parallel are connected to the outer side of each press plate (8), all the hydraulic cylinders (9) are connected to a pump station, a pressure gauge and a pressure regulating valve are arranged;