CN1260235A

CN1260235A - Compound filtering aid

Info

Publication number: CN1260235A
Application number: CN 98126821
Authority: CN
Inventors: 刘英杰
Original assignee: Individual
Current assignee: Individual
Priority date: 1998-12-31
Filing date: 1998-12-31
Publication date: 2000-07-19
Anticipated expiration: 2018-12-31
Also published as: CN1120043C

Abstract

The composite filter aid includes basic filter aid and additional filter aid, and is characterized by that said additional filter aid comprises lignocellulose whose content ratio is 3-50%, and said basic filter aid can be the powdered filter aids of diatomaceous earth, active white earth, active carbon, pearlite or resin powder, etc., also can be fibrous filter aids of asbestos fiber, etc.. Said composite filter aid can raise filtering speed, shorten original production period, raise production yield and reduce production cost, and possesses extensive application range.

Description

A kind of composite filter aid

The present invention relates to a kind of filtration adjuvant, specifically a kind of composite filter aid.

All need use filter aid to guarantee the quality of product in the filtering technique in fields such as wine brewing, food, pharmacy, oil, chemical industry, filter aid commonly used has diatomite, active carbon, atlapulgite, perlite, mineral fiber, resin-oatmeal etc.Above-mentioned filter aid exists to a certain extent all in use that permeability is not ideal enough, life cycle is short, manufacturability is not good enough, filter effect remains weak points such as further raising.

The object of the present invention is to provide a kind of composite filter aid,, and longer life cycle is arranged, improve, reduce cost by the product quality of filter medium with raising permeability, manufacturability and filter effect.

The objective of the invention is to be achieved through the following technical solutions, specifically comprise basic filter aid and additional filter aid, it is characterized in that said additional filter aid is a lignocellulosic, and lignocellulosic shared ratio in composite filter aid is 3%～50%.Nearly all known filter aid commonly used can be as basic filter aid of the present invention, as diatomite, active carbon, atlapulgite, perlite, resin-oatmeal and mineral fiber.

The composite filter aid that the present invention provides can overcome single filter aid (particularly graininess filter aid) the relatively poor shortcoming of permeability, because the matrix of lignocellulosic is fibrous, its diameter is about 10～20 microns, its length is about 30～300 microns, it can play between particle and support and bridging action, again because wood fibre have bigger specific surface (being about 800～1200 meters squared per gram) and good absorption property, and have certain little electric charge (Zeta potential) again, therefore can significantly improve the permeability of single filter aid, improve the rate of filtration, shorten original production cycle, improve the quality of products, prolong the life cycle of filter aid, improve original manufacturability, particularly can accelerate the formation of precoated shet, and the toughness of filtering layer is increased, significantly improve original processing performance.Another significant advantage of the present invention is to use very convenient, can need not change original production technology and production equipment fully, therefore is easy to apply.

The present invention has following accompanying drawing:

The electron micrograph of Fig. 1 lignocellulosic

The electron micrograph of Fig. 2 lignocellulosic

Fig. 3 lignocellulosic is used for precoating and filters schematic diagram

Fig. 4 lignocellulosic is used for adding the filtration schematic diagram

Below in conjunction with accompanying drawing the present invention is described in further detail.

Lignocellulosic is to be raw material with the wood pulp, forms through degraded, purification, oven dry, sterilization, and 10～20 microns of its fibre diameters, 30～300 microns of fibre lengths, fiber content is more than 99%.

Because the obdurability and the fibroid of lignocellulosic, the filter membrane top layer forms irregular network when mixing use with the particulate filter medium, give full play to " bridge formation " and " crosslinked " effect, ensured discreteness, dispersion stability and the permeability of particulate filter bed, effectively controlled filter strip and gone out and filter membrane leakage phenomenon.The cunning of the lignocellulosic property of loosing makes the filter cake stripping performance good, greatly reduces the damage to underbed, and the delay of liquid to be filtered reduces in the filter cake, has improved the yield of product.

The electron micrograph of lignocellulosic is referring to Fig. 1, Fig. 2, and lignocellulosic filters and adds sectional schematic diagram when filtering referring to Fig. 3, Fig. 4 in precoating, as can be seen from the figure the shape of lignocellulosic and the bridge formation when filtering, crosslinked, hold back situation.

Diatomite, atlapulgite, activated carbon, perlite or resin-oatmeal equigranular filter aid and lignocellulosic compatibility use, and by the filtrate body following embodiment can be arranged to different:

1. when using with one of above-mentioned filter aid compatibility, lignocellulosic shared ratio in the filter aid total amount is 3%～10%, for example to the plate and frame filter in beer, the liquor industry, when precoating is filtered, the shared ratio of lignocellulosic is chosen as 5%～10%, and wherein 6%～8% is preferable; The lignocellulosic ratio is chosen as 3%～7% when adding filtration, and wherein 5%～6% is preferable.Araeosystyle, vertical, rotation, centrifugal disc, metal mesh type filter, lignocellulosic can be used for adding and filter by 6%～8% of former filter aid consumption, are used for precoating by 8%～10% and filter.The beer product shelf-life that obtains like this can prolong three months on the original basis, and turbidity can reduce 0.2EBC, filters cost and can reduce by 20～30%, can improve filtration yield 30～40%, saves filter material about 30%.When the ratio of lignocellulosic surpasses 10%, though can obtain better filter effect, from economic considerations might not be worthwhile, so 12%, 15% ratio also can be used, high again ratio may be uneconomic to the filtration of beer, liquor.

2. in the filtration of peanut oil, salad oil, vegetable seed wet goods edible vegetable oil, the cabinet type filter of plate is pressed 10～20% of filter aid total amount add lignocellulosics, can obtain effect preferably, particularly decolouring, degreasing, dewaxing, the depickling aspect has better effect.10%, 12%, 15%, 18%, 20% etc. all is available scheme in aforementioned proportion.Requiring for filter effect is not that the adding proportion of too high situation 3%, 5%, 7%, 9% also is desirable.

3. when adopting the rotary drum filter to filtrations such as antibiotic oral liquids in the pharmaceuticals industry, add lignocellulosics by 20～30% of total filter aid consumption and can obtain filter effect preferably, particularly effect is even more ideal aspect removal impurity and sterilization.The ratio of lignocellulosic is 20%, 23%, 25%, 28%, 30% all to be the schemes that can adopt.To some product of higher value, 33%, 36%, 40% consumption also is feasible.

4. in the series of products of the additive of petrochemical industry and OIL IN LUBRICATING OIL PRODUCTION filter, can add lignocellulosic in 40～50% ratio, wherein 40%, 42%, 44%, 46%, 48%, 50% all is desirable ratios, and these ratios also are applicable to the filtration in the paint production.High like this ratio is owing to big, mobile poor by the viscosity of filtrate body, needs higher permeability.

In the above-mentioned prescription, can in advance lignocellulosic and described graininess filter aid be mixed into the product sale, also can add lignocellulosic according to the above ratio, original particle filter aid of deduction same ratio during department in the filtration place.Use that what deserves to be explained is prescription of the present invention need not to change existing equipment and original production process, and this point is the major reason that the present invention is easy to apply.

Except forming the composite filter aid with graininess filter aid compatibility, lignocellulosic can also be formed composite filter aid with fibrous filter aid, for example can with mineral fiber element (as asbestos fibre) compatibility, said lignocellulosic proportion can be 20～60%, according to different instructions for use 20%, 30%, 40%, 50%, 60% grade all is operable prescriptions, the proportioning of wherein plain with 50% mineral fiber and 50% lignocellulosic is for well, the composite filter aid of this proportioning can be called the technical grade composite filter aid, because it is applicable to the filtration industrial products, and foregoing lignocellulosic accounts for 99%, lignocellulosic through sterilization can be described as the food-grade filter aid, because it can filter drinks, beverage, edible wet goods edible, the product of drinking.In the additive of petrochemical industry, lubricated wet goods filter, to the plate and frame filter, the said technical grade composite filter aid of the present invention (for example composite filter aid of being made up of 50% asbestos fibre, 50% lignocellulosic) can be used (the original filter aid that adds corresponding proportion less) by 8～20% of former diatomite (or atlapulgite or active carbon etc.) consumption, can obtain better effects, wherein 8%, 10%, 12%, 14%, 15%, 16%, 18%, 20% etc. all is desirable embodiment, and what need to consider just selects a suitable effect/cost ratio; Can be used (the former filter aid of using that adds corresponding proportion simultaneously less) by 30～40% of former diatomite (or other particle filter aid) consumption to paint industry pommel horse formula wire netting filter, can produce high-quality paint, wherein 30%, 33%, 35%, 38%, 40% ratio all can adopt.

The composite filter aid that adopts the present invention to provide can effectively improve the rate of filtration, can effectively sieve filtering to the granulometric impurity that originally is difficult to filtering less than filtration channel, to hot and cold coagulum, suspension, the colloidal substance in the suspension, comparatively desirable screening filtration result is arranged.

Claims

1. a composite filter aid comprises basic filter aid and additional filter aid, it is characterized in that said additional filter aid is a lignocellulosic, and lignocellulosic shared ratio in composite filter aid is 3%～50%.

2. composite filter aid according to claim 1 is characterized in that said basic filter aid is diatomite or active carbon or atlapulgite or perlite or resin-oatmeal.

3. composite filter aid according to claim 1 is characterized in that said basic filter aid is an asbestos fibre, and said lignocellulosic proportion is 20%～50%.

4. composite filter aid according to claim 1 and 2, the ratio that it is characterized in that said lignocellulosic is 3%～10%.

5. composite filter aid according to claim 1 and 2, the ratio that it is characterized in that said lignocellulosic is 10%～20%.

6. composite filter aid according to claim 1 and 2, the ratio that it is characterized in that said lignocellulosic is 20%～30%.

7. composite filter aid according to claim 1 and 2, the ratio that it is characterized in that said lignocellulosic is 30%～40%.

8. composite filter aid according to claim 1 and 2, the ratio that it is characterized in that said lignocellulosic is 40%～50%.