CN1613758A - Production of activated carbon from dregs from longoze saponin production - Google Patents

Abstract

A production of active carbon from longoza saponin residual is disclosed. It is carried out by: 1) putting longoza saponin residual into carbonizing furnace at temperature 250-350deg.C for 0.5-1 hr; 2) immersing in ZnCl2 solution with weight concentration 20%-60% for 12-24 hrs, and feed liquid ratio 1:1.5-3; 3) putting into activating furnace at temperature 500-600deg.C for 1-2 hrs; 4) alkali washing and water poaching; 5) drying and finishing. It achieves low cost and good activating performance.

Description

Produce residue with turmeric saponin and prepare process of active carbon

Technical field

The present invention relates to prepare process of active carbon, particularly prepare process of active carbon with the plant residue that produces in the activity in production.

Background technology

Gac is the porous carbonaceous material of a class, is a kind of sorbent material that is of wide application.It has acidproof, alkaline-resisting, and can stand the effect of water logging, high temperature and high pressure, use and can regenerate after losing efficacy.Its character depends primarily on raw material manufacturing process and post processing mode.

Traditional industrial preparation mainly is that the hydrocarbon polymer with high carbon content is a raw material, through high temperature carbonization, and the product that activation is made.Present industrial gac raw material is mainly derived from carbo lignius, fruit shell carbon, ature of coal charcoal, malthenes charcoal, synthetic resins charcoal, and organic waste materials charcoal etc., the normal operational path that adopts is chemical activation method (a medicine activation method), as Chinese patent notification number CN1015617B disclosed " with the method for producing active carbon from waste slag of citric acid fermented with dry sweet potato ", a kind of exactly employing zinc chloride activation citric acid fermented with dry sweet potato waste residue prepares process of active carbon.But the technology difference that different feedstock production gacs is taked, the difference that exists between the physical and chemical performance are also very big.For example, turmeric saponin is produced residue if take the technology of existing patent CN1015617B to prepare gac, can not reach patent described " having reached the standard-required of outlet gac " at all.Thereby constantly seek the new raw material of Activated Carbon Production, and explore its distinctive optimum process condition, increasing new variety is vital tasks of gac industrial development.

Patent CN1015617B, promptly the preparation technology of " with the method for producing active carbon from waste slag of citric acid fermented with dry sweet potato " is: be 1.8g/cm with 1: 1～1.5 ratio at proportion with the citric acid fermented with dry sweet potato waste residue earlier ³ZnCl ₂Flooded in the solution 10～15 hours, and then be charing 60～90 minutes in 300～400 ℃ the charring furnace in temperature, in being 650～750 ℃ activation furnace, temperature activates 90～105 minutes again, in 10% HCl solution, boiled 3.5～4.5 hours at last, rinsing is to pH5～7, in 100～150 ℃ loft drier, dry, pulverize and get product by 100 mesh sieves.

This technology is a kind of in the medicament activating process, has characteristics such as product yield height, activation temperature are low, but the incompatibility turmeric saponin produces residue and prepare gac, mainly shows:

1, the main component of turmeric saponin production residue is Mierocrystalline cellulose and xylogen, and volume is loose, and density is less, and water-absorbent is stronger; And this residue is also relatively poor with the wetting property of solution through the organic solvent extracting, thereby, bigger if with medicament is flooded required pharmaceutical quantities when pre-treatment;

2, turmeric saponin is produced the pyrolysis temperature low (through about 300 ℃ of thermogravimetric analysis) of residue, and is higher when temperature, when carbonization time is longer, thereby raw material is easy to yield and quality that ashing influences product.

Summary of the invention

Technical problem to be solved by this invention is: provide a kind of and prepare process of active carbon with turmeric saponin production residue.

The present invention solves the problems of the technologies described above the technical scheme that is adopted:

Produce residue with turmeric saponin and prepare process of active carbon, its step comprises:

(1) turmeric saponin is produced residue and place charring furnace, carbonization time is 0.5～1 hour under 250～350 ℃ of temperature;

(2) step (1) products therefrom being put into weight concentration is 20%～60% ZnCl ₂Solution in flooded 12～24 hours, the weight solid-liquid ratio of step (1) products therefrom and solution is 1: 1.5～3;

(3) place activation furnace, soak time is 1～2 hour under 500～600 ℃ of temperature;

(4) using alkali cleaning earlier, is 7～8 with water rinse to pH value again;

(5) drying, finished product.

In the such scheme, ZnCl ₂The weight concentration of solution is 38～43%, and solid-liquid ratio is 1: 2.8～3.

Compare with prior art (Chinese patent notification number CN1015617B disclosed method), the inventive method has the following advantages:

1, produces the characteristics of residue according to turmeric saponin, adopt directly charing earlier, use medicine activatory mode again, because the burning mistake rate of charing is 40%～50%, can overcome simultaneously the relatively poor shortcoming of wetting property of residue and solution again, therefore, significantly reduced the consumption of dipping medicament, the turmeric saponin of unit weight is produced residue dipping dosing less than with half of art methods dipping dosing;

2, because turmeric saponin is produced the pyrolysis characteristics of residue, employed temperature has only 500～600 ℃ during activation, not only can save energy consumption, also can improve the activation performance of product;

3, turmeric saponin production residue is the resistates after the strong acid hydrolysis, and main component is that silt is (through ash analysis SiO in the ash content ₂Be about 76.22%), thereby aftertreatment carries out deliming, dipping with alkali cleaning, to change the surface chemical property of gac, can significantly improve the activated carbon surface chemical property, improves the ability of removing or separating certain material.

4, employed temperature has only 250～350 ℃ of temperature during charing, and the time has only 0.5～1 hour, thereby can avoid ashing under the high temperature to influence the yield and the quality of product.

Remove or to separate the ability of certain material strong with the gac of the inventive method preparation, it is used for the processing that turmeric saponin is produced high concentrated organic wastewater, can decolour well, organic substance in the absorption waste water, the COD clearance reaches 75%.

Embodiment

The present invention comprises with the step that turmeric saponin production residue prepares process of active carbon:

(1) turmeric saponin is produced residue and place charring furnace, carbonization time is 0.5～1 hour under 250～350 ℃ of temperature;

(2) step (1) products therefrom being put into weight concentration is 20%～60% ZnCl ₂Solution in flooded 12～24 hours, the weight solid-liquid ratio of step (1) products therefrom and solution is 1: 1.5～3;

(3) place activation furnace, soak time is 1～2 hour under 500～600 ℃ of temperature;

(4) boiled 20 minutes earlier with about 20% sodium hydroxide, wash with water again to the pH value be 7～8;

(5) in 100～150 ℃ loft drier, dry finished product.

The inventive method specific embodiment 1～5 is as table 1.

Contrast process program 1,2 in the table 1 is a Chinese patent notification number CN1015617B disclosed method, the steps include:

(1) turmeric saponin being produced residue, to put into weight concentration be 40%～60% ZnCl ₂Solution in flooded 10～15 hours, the weight solid-liquid ratio that turmeric saponin is produced residue and solution is 1: 1～1.5;

(2) be charing 1～1.5 hour in 300～400 ℃ the charring furnace in temperature;

(3) in being 650～750 ℃ activation furnace, temperature activates 1.5～1.75 hours;

(4) in 10% hydrogen chloride solution, boiled 3.5～4.5 hours;

(5) be 5～7 with water rinse to pH value;

(6) in 100～150 ℃ loft drier, dry finished product.

Table 1: turmeric saponin is produced invented technology and the contrast craft embodiment that residue prepares gac

Learn that by table 1 it is the feedstock production gac that contrast process program 1,2 is produced residue with turmeric saponin, its transformation efficiency low (less than 25%), the iodine sorption value of product is low, no productive value.

Contrast process program 3 has strengthened ZnCl ₂(solid-liquid ratio of turmeric saponin production residue and solution is 1: 5 to the consumption of solution, exceeded Chinese patent notification number CN1015617B scope of disclosure), other step just can make transformation efficiency reach 35% with contrast process program 1,2, and iodine sorption value reaches 600mg/g.

The gac transformation efficiency height (greater than 40%) of embodiment of the present invention 2,3, the iodine sorption value of product is optimum implementation up to more than the 1000mg/g, the ZnCl that it adopts ₂The weight concentration of solution is 38～43%, and solid-liquid ratio is 1: 2.8～3.

Claims (2)

1, produce residue with turmeric saponin and prepare process of active carbon, it is characterized in that: its step comprises:

(1) turmeric saponin is produced residue and place charring furnace, carbonization time is 0.5～1 hour under 250～350 ℃ of temperature;

(2) step (1) products therefrom being put into weight concentration is 20%～60% ZnCl ₂Solution in flooded 12～24 hours, the weight solid-liquid ratio of step (1) products therefrom and solution is 1: 1.5～3;

(3) place activation furnace, soak time is 1～2 hour under 500～600 ℃ of temperature;

(4) using alkali cleaning earlier, is 7～8 with water rinse to pH value again;

(5) drying, finished product.

2, the method for claim 1 is characterized in that: ZnCl ₂The weight concentration of solution is 38～43%, and solid-liquid ratio is 1: 2.8～3.