CN103936554A

CN103936554A - Two-time glycerol decoloring method

Info

Publication number: CN103936554A
Application number: CN201410185760.4A
Authority: CN
Inventors: 叶活动; 罗敏健
Original assignee: LONGYAN ZHUOYUE NEW ENERGY CO Ltd
Current assignee: LONGYAN ZHUOYUE NEW ENERGY CO Ltd
Priority date: 2014-05-05
Filing date: 2014-05-05
Publication date: 2014-07-23
Anticipated expiration: 2034-05-05
Also published as: CN103936554B

Abstract

The invention discloses a two-time glycerol decoloring method which is operated according to the following steps: 1, adding glycerol which is not decolored and active carbon to a 1# decoloring pot for primary decoloration; 2, pumping the glycerol into a 1# filter press through a 1# pump after the primary decoloration, and adding the active carbon to a 2# decoloring pot for secondary decoloration, wherein the primarily decolored glycerol obtained through pressure filtration flows into the 2# decoloring pot; regularly cleaning waste active carbon inside the 1# filter press; and 3, pumping the secondarily decolored glycerol into a 2# filter press through a 2# pump for the pressure filtration to obtain finished glycerol, recovering all the active carbon inside the 2# filter press, and complementally adding the active carbon to the 1# decoloring pot. The two-time glycerol decoloring method disclosed by the invention has the characteristics of small active carbon usage amount, good decoloring effect and low production cost.

Description

Glycerine secondary decolourization method

Technical field

The present invention relates to the working method of Organic chemical products glycerine, be specifically related to glycerin decoloring method.

Background technology

Along with the universal of biofuel suitability for industrialized production and application with promote, its byproduct crude glycerin output also increases sharply, in production of biodiesel process, 1 ton of biofuel of average every production can 0.05～0.1 ton of raw glycerine of by-product; Domestic production of biodiesel enterprise is for reducing production costs, generally adopt taking waste oil (as sewer oil, hogwash fat, vegetable acid carburetion etc.) as main material production biofuel, due to the complicacy of raw material sources, that its byproduct crude glycerin ubiquity is of poor quality, purity is low, impurity is many, process the problems such as numerous and diverse, need to pass through the operations such as purifying, evaporation, distillation, deodorization, decolouring, just can make the glycerine requirement that is up to state standards of producing, the height of one of them important indicator Color of Glycerin directly has influence on its use and Application Areas.At present, the decoloring method of glycerine generally adopts charcoal absorption processing to reduce Color of Glycerin, gac is the porous charcoal material of being made up through charing, activating process of carbonaceous organic material, it is good non-polar adsorbent, nonpolar and the little pigment molecular of polarity are had to good selective adsorption, can adsorbed polymer material, effective especially to removing of red and green pigment; At present, the production unit of the method is mainly made up of a bleacher and a pressure filter, concrete operation method is: in bleacher, add no bleaching glycerine and gac, stir then from pumping toward pressure filter at a certain temperature, glycerine after press filtration flows in Receiving bin, used gac in periodic cleaning pressure filter; There is the defect that activated carbon dosage is large, Color of Glycerin is dark, production cost is high in this decoloring method.

Summary of the invention

The object of this invention is to provide that a kind of activated carbon dosage is little, good decolorizing effect, glycerine secondary decolourization method that production cost is low.

For realizing above object, glycerine secondary decolourization method of the present invention operates as follows:

The first step: add no bleaching glycerine and gac once to decolour in 1# bleacher;

Second step: once the glycerine after decolouring is through 1# pumping toward 1# pressure filter, and the first decolouring glycerine being press-filtered out flows to 2# bleacher, adds gac to carry out secondary decolourization in 2# bleacher;

Waste active carbon in periodic cleaning 1# pressure filter;

The 3rd step: the glycerine after secondary decolourization obtains finished product glycerine by 2# pumping toward the press filtration of 2# pressure filter;

All reclaim the gac in 2# pressure filter, and will supplementary joining in 1# bleacher.

The glycerine secondary decolourization device that above-mentioned glycerine secondary decolourization method adopts comprises 1# bleacher, 1# pressure filter, 2# bleacher, 2# pressure filter, 1# pump, 2# pump, front gac header tank, recovered carbon header tank, rear gac header tank, waste active carbon groove, gac accumulator tank, glycerine Receiving bin and valve; Front gac header tank and recovered carbon header tank are located at 1# bleacher top; 1# pump is located between 1# bleacher and 1# pressure filter, is connected with valve by pipeline, and waste active carbon groove is located at by 1# pressure filter; The outlet of 1# pressure filter connects 2# bleacher by pipeline, and rear gac header tank is located at 2# bleacher top; 2# pump is located between 2# bleacher and 2# pressure filter, is connected with valve by pipeline, and the outlet of 2# pressure filter connects glycerine Receiving bin, and gac accumulator tank is located at by 2# pressure filter.

According to absorption principle, gac once adds only sets up primary sorption balance, and while adding gac, can bring into play the vigor of new interpolation gac in batches, remains pigment and sets up new adsorption equilibrium, thereby reach better decolorizing effect during with balance for the first time.Above-mentioned secondary decolourization method adopts gac to add in batches, in the situation that gac uses total amount identical, add in batches than the disposable good decolorizing effect that adds, in other words, in the situation that reaching identical decolorizing effect, add in batches the usage quantity of fashionable gac still less.

Above-mentioned in glycerine secondary decolourization method, gac in 2# bleacher to also thering is the ability that dark glycerine is decoloured again after the glycerin decoloring of just decolouring, for making full use of gac, all reclaim gac the supplementary 1# bleacher that joins in 2# pressure filter, for the first decolouring to dark glycerine, in guaranteeing decolorizing effect, gac is fully used, significantly reduce activated carbon dosage.

Brief description of the drawings

Fig. 1 is glycerine secondary decolourization method operational flowchart of the present invention.

Fig. 2 is the glycerine secondary decolourization apparatus structure schematic diagram of realizing glycerine secondary decolourization method of the present invention.

Reference numeral: 1# bleacher 1,1# pressure filter 2,2# bleacher 3,2# pressure filter 4,1# pump 5,2# pump 6, front gac header tank 7, recovered carbon header tank 8, rear gac header tank 9, waste active carbon groove 10, gac accumulator tank 11, glycerine Receiving bin 12, valve 13.

Embodiment

Below in conjunction with the drawings and specific embodiments, glycerine secondary decolourization method of the present invention is described in further details.

Shown in Fig. 1, glycerine secondary decolourization method of the present invention operates as follows:

Waste active carbon in periodic cleaning 1# pressure filter;

The glycerine secondary decolourization device that shown in Fig. 2, above-mentioned glycerine secondary decolourization method adopts comprises 5m ³1# bleacher 1,70m ²1# pressure filter 2,5m ³2# bleacher 3,70m ²2# pressure filter 4,5m ³/ h 1# pump 5,5m ³/ h 2# pump 6,0.2m ³front gac header tank 7,0.2m ³recovered carbon header tank 8,0.2m ³rear gac header tank 9,2m ³waste active carbon groove 10,2m ³gac accumulator tank 11,5m ³glycerine Receiving bin 12 and valve 13; Front gac header tank 7 and recovered carbon header tank 8 are located at 1# bleacher top; 1# pump 5 is located between 1# bleacher 1 and 1# pressure filter 2, is connected with valve 13 by pipeline, and waste active carbon groove 10 is located at by 1# pressure filter; The outlet of 1# pressure filter connects 2# bleacher 3 by pipeline, and rear gac header tank 9 is located at 2# bleacher 3 tops; 2# pump 6 is located between 2# bleacher 3 and 2# pressure filter 4, is connected with valve 13 by pipeline, and the outlet of 2# pressure filter connects glycerine Receiving bin 12, and gac accumulator tank 11 is located at by 2# pressure filter.

Adopt the effect comparison of above-mentioned glycerine secondary decolourization device and operation steps technology and a decolouring technology of existing glycerine in table 1 and table 2.

Table 1: glycerine secondary decolourization effect

Table 2: the glycerin decoloring effect of prior art

As can be seen from Table 1 and Table 2, adopt glycerine secondary decolourization method of the present invention to there is following effect:

1,, in the situation that gac usage quantity is identical, glycerine secondary decolourization on average reduces 20# left and right than the color and luster Hazen (Pt-Co) that once decolours.

2,, in the situation that decolorizing effect is identical, glycerine secondary decolourization is saved more than 50% activated carbon dosage than once decolouring.

Claims

1. a glycerine secondary decolourization method, is characterized in that operating as follows:

Waste active carbon in periodic cleaning 1# pressure filter;

2. the glycerine secondary decolourization device of realizing glycerine secondary decolourization method described in claim 1, is characterized in that: it comprises 1# bleacher, 1# pressure filter, 2# bleacher, 2# pressure filter, 1# pump, 2# pump, front gac header tank, recovered carbon header tank, rear gac header tank, waste active carbon groove, gac accumulator tank, glycerine Receiving bin and valve; Front gac header tank and recovered carbon header tank are located at 1# bleacher top; 1# pump is located between 1# bleacher and 1# pressure filter, is connected with valve by pipeline, and waste active carbon groove is located at by 1# pressure filter; The outlet of 1# pressure filter connects 2# bleacher by pipeline, and rear gac header tank is located at 2# bleacher top; 2# pump is located between 2# bleacher and 2# pressure filter, is connected with valve by pipeline, and the outlet of 2# pressure filter connects glycerine Receiving bin, and gac accumulator tank is located at by 2# pressure filter.