阅读说明：本技术 一种基于膜技术烟草萃取液深度纯化工艺 (Tobacco extract deep purification process based on membrane technology ) 是由 袁林峰 陈越峰 叶亚兴 宋海斌 胡飞 于 2019-08-29 设计创作，主要内容包括：一种基于膜技术烟草萃取液深度纯化工艺,它涉及烟草萃取液技术领域。它包含以下操作步骤：第一步,将烟草在清洁容器中进行清洗去除烟草内的杂质；第二步,对烟草进行真空浓缩；第三步,将烟草与乙醇溶液进行萃取；第四步,将烟草和萃取液送入离心机进行固液分离；第五步,将分离的液体放入矩形筛进行过滤,第六步,将过滤后的液体通过离心泵送入膜过滤分离系统进行膜分离；第七步,在膜过滤分离系统中加入中和液体对废液进行中和处理,它可以对烟草萃取液进行深度纯化,可以减少废水的排放,还可以减轻废水处理的压力。(A tobacco extract deep purification process based on a membrane technology relates to the technical field of tobacco extract. The method comprises the following operation steps: firstly, cleaning tobacco in a cleaning container to remove impurities in the tobacco; secondly, carrying out vacuum concentration on the tobacco; thirdly, extracting the tobacco with ethanol solution; fourthly, feeding the tobacco and the extract liquor into a centrifugal machine for solid-liquid separation; fifthly, putting the separated liquid into a rectangular sieve for filtering, and sixthly, sending the filtered liquid into a membrane filtration and separation system through a centrifugal pump for membrane separation; and step seven, adding neutralizing liquid into the membrane filtration separation system to neutralize the waste liquid, wherein the neutralizing liquid can deeply purify the tobacco extract liquid, reduce the discharge of waste water and reduce the pressure of waste water treatment.)

1. A tobacco extract deep purification process based on a membrane technology is characterized by comprising the following operation steps: firstly, cleaning tobacco in a cleaning container to remove impurities in the tobacco; secondly, carrying out vacuum concentration on the tobacco; thirdly, extracting the tobacco with ethanol solution; fourthly, feeding the tobacco and the extract liquor into a centrifugal machine for solid-liquid separation; fifthly, putting the separated liquid into a rectangular sieve for filtering, and sixthly, sending the filtered liquid into a membrane filtration and separation system through a centrifugal pump for membrane separation; and step seven, adding a neutralizing liquid into the membrane filtration separation system to neutralize the waste liquid.

2. The deep purification process of tobacco extract liquid based on membrane technology as claimed in claim 1, wherein: the membrane filtration separation system is a reverse osmosis filtration separation circulating device, the reverse osmosis filtration separation circulating device adopts a roll type reverse osmosis membrane device or a tubular reverse osmosis membrane device, and the reverse osmosis membrane is a polyamide membrane, a polyether sulfone membrane, a polypropylene membrane or a polyethylene membrane with 35% magnesium sulfate rejection rate.

3. The deep purification process of tobacco extract liquid based on membrane technology as claimed in claim 2, wherein: the reverse osmosis filtering separation circulating device has the operating pressure of 10-50 bar and the operating temperature of 10-80 ℃.

4. The deep purification process of tobacco extract liquid based on membrane technology as claimed in claim 1, wherein: the centrifuge is a horizontal spiral sedimentation centrifuge, the set rotating speed is 2800RPM, the speed difference is 2, and the inlet flow is 250L/min.

5. The deep purification process of tobacco extract liquid based on membrane technology as claimed in claim 1, wherein: the screen mesh number of the first layer and the second layer of the rectangular screen is 100 meshes from top to bottom, the screen mesh number of the third layer and the fourth layer of the rectangular screen is 80 meshes, the motion trail of the screen mesh is oval, and the inlet flow rate of the rectangular screen is 250L/min.

6. The deep purification process of tobacco extract liquid based on membrane technology as claimed in claim 1, wherein: the neutralizing liquid is any one of sodium hydroxide, potassium hydroxide, sodium bicarbonate, sodium acetate, sodium pyrophosphate and sodium carbonate.

Technical Field

The invention relates to the technical field of tobacco extract, in particular to a process for deeply purifying tobacco extract based on a membrane technology.

Background

The tobacco is solanaceae herbaceous plant, the tobacco belongs to more than 60 varieties, and the tobacco mainly comprises 1-3% of nicotine, 5-15% of protein, 11% of cellulose, 20% of hemicellulose, 12-16% of organic acid, 2-7% of fat, 0.52-2.61% of polybasic acid tannin, 12% of pectin and 10% of ash content by weight. The tobacco leaves are directly applied to the cigarette production, so that the cost of the tobacco leaves is high, and the tar and harm reduction is not facilitated. Therefore, in the 50 s of the 20 th century, the tobacco sheet technology was developed, and the tobacco sheets are added into cigarette production according to a certain proportion, so that the cigarette cost can be reduced, the raw materials can be saved, the filling capacity and the combustibility of the cigarette can be improved, the smoke components of the cigarette can be changed, the tar content can be reduced, and the inherent quality of the cigarette can be changed.

The production process of the current mature tobacco sheet mainly adopts a paper making method, namely, tobacco materials are soaked and extracted by water, the tobacco water-soluble substances and insoluble substances such as tobacco fibers are subjected to solid-liquid separation by squeezing, the obtained solid is made into a fiber sheet base by paper making, the obtained liquid is concentrated into tobacco water-soluble substance concentrated solution, other flavoring substances are added to the tobacco water-soluble substance concentrated solution, the tobacco water-soluble substance concentrated solution is dip-coated or sprayed on the sheet base, and finally the tobacco sheet is prepared by drying and cutting. The main raw materials for producing the tobacco sheets are waste tobacco stems, tobacco powder, low-grade tobacco leaves, tobacco fragments and the like in the whole cigarette production process, the extraction process mainly comprises a water extraction method, an alcohol extraction method and the like, no matter which extraction method is adopted, waste water is finally generated, the waste water contains certain effective components, the waste is caused by direct treatment, and the sewage treatment pressure is increased.

In order to solve the problems, through a plurality of tests, a treatment technology aiming at the waste water in the production process of the tobacco sheets is developed, and the pressure of waste water treatment can be reduced.

Disclosure of Invention

The invention aims to provide a tobacco extract deep purification process based on a membrane technology, aiming at overcoming the defects and shortcomings of the prior art, and the process can be used for deeply purifying the tobacco extract, reducing the discharge of waste water and relieving the pressure of waste water treatment.

In order to achieve the purpose, the invention adopts the following technical scheme:

A tobacco extract deep purification process based on a membrane technology comprises the following operation steps: firstly, cleaning tobacco in a cleaning container to remove impurities in the tobacco; secondly, carrying out vacuum concentration on the tobacco; thirdly, extracting the tobacco with ethanol solution; fourthly, feeding the tobacco and the extract liquor into a centrifugal machine for solid-liquid separation; fifthly, putting the separated liquid into a rectangular sieve for filtering, and sixthly, sending the filtered liquid into a membrane filtration and separation system through a centrifugal pump for membrane separation; and step seven, adding a neutralizing liquid into the membrane filtration separation system to neutralize the waste liquid.

Preferably, the membrane filtration and separation system is a reverse osmosis filtration and separation circulating device, the reverse osmosis filtration and separation circulating device adopts a roll type reverse osmosis membrane device or a tubular reverse osmosis membrane device, and the reverse osmosis membrane is a polyamide membrane, a polyether sulfone membrane, a polypropylene membrane or a polyethylene membrane with 35% magnesium sulfate rejection rate.

Preferably, the reverse osmosis filtering separation circulating device has the operating pressure of 10-50 bar and the operating temperature of 10-80 ℃.

Preferably, the centrifuge of the invention is a horizontal screw decanter centrifuge with a set rotation speed of 2800RPM, a speed difference of 2 and an inlet flow rate of 250L/min.

Preferably, the mesh number of the first layer and the second layer of the rectangular screen mesh is 100 meshes from top to bottom, the mesh number of the third layer and the fourth layer of the rectangular screen mesh is 80 meshes, the movement track of the screen mesh is an ellipse, and the inlet flow rate of the rectangular screen mesh is 250L/min.

Preferably, the neutralizing liquid of the present invention is any one of sodium hydroxide, potassium hydroxide, sodium bicarbonate, sodium acetate, sodium pyrophosphate, and sodium carbonate.

After the technical scheme is adopted, the invention has the beneficial effects that: the method can deeply purify the tobacco extract, reduce the discharge of waste water and reduce the pressure of waste water treatment.

Detailed Description

The technical scheme adopted by the specific implementation mode is that the method comprises the following operation steps: firstly, cleaning tobacco in a cleaning container to remove impurities in the tobacco; secondly, carrying out vacuum concentration on the tobacco; thirdly, extracting the tobacco with ethanol solution; fourthly, feeding the tobacco and the extract liquor into a centrifugal machine for solid-liquid separation; fifthly, putting the separated liquid into a rectangular sieve for filtering, and sixthly, sending the filtered liquid into a membrane filtration and separation system through a centrifugal pump for membrane separation; and step seven, adding a neutralizing liquid into the membrane filtration separation system to neutralize the waste liquid.

The membrane filtration separation system is a reverse osmosis filtration separation circulating device, the reverse osmosis filtration separation circulating device adopts a roll type reverse osmosis membrane device or a tubular reverse osmosis membrane device, and the reverse osmosis membrane is a polyamide membrane, a polyether sulfone membrane, a polypropylene membrane or a polyethylene membrane with 35% magnesium sulfate rejection rate.

The screen mesh number of the first layer and the second layer of the rectangular screen mesh is 100 meshes from top to bottom, the screen mesh number of the third layer and the fourth layer of the rectangular screen mesh is 80 meshes, the movement track of the screen mesh is oval, and the inlet flow rate of the rectangular screen mesh is 250L/min.

The neutralizing liquid of the invention is any one of sodium hydroxide, potassium hydroxide, sodium bicarbonate, sodium acetate, sodium pyrophosphate and sodium carbonate.