CN102698746A

CN102698746A - Method for recovering lost noble metal catalyst at sodium gluconate oxidation section

Info

Publication number: CN102698746A
Application number: CN201210199201XA
Authority: CN
Inventors: 安庆堂; 王建中; 冯斌斌; 郑永双; 安民
Original assignee: HENAN XINGFA FINE CHEMICAL CO Ltd
Current assignee: HENAN XINGFA FINE CHEMICAL CO Ltd
Priority date: 2012-06-18
Filing date: 2012-06-18
Publication date: 2012-10-03

Abstract

The invention relates to a method for recovering a lost noble metal catalyst at a sodium gluconate oxidation section. The method can effectively solve the problems of catalyst loss, environment pollution and high production cost in the production process. According to the technical scheme, the method comprises the following steps of: sucking air by a circulating jet pump through an air inlet, mixing the air and an aqueous solution of glucose in an oxidation kettle, and performing catalytic oxidation by using a palladium-carbon catalyst supported by active carbon; discharging oxidation exhaust subjected to catalytic oxidation to an emptying main pipeline through an air outlet in the oxidation kettle, and pumping to an air exhaust absorption tower by an axial flow fan on the emptying main pipeline; pumping water in a water tank on the lower part in the absorption tower by a circulating water pump connected with the absorption tower for absorbing air exhaust to spray the air exhaust by a spray head; and circularly recovering the sprayed water to the water tank, and settling and enriching active carbon granules of the mixed palladium-carbon catalyst in the oxidation exhaust through a discharge hole at the bottom of the absorption tower. By the method, the catalyst can be effectively recovered, and the production method can be reduced; and the method is an innovation of the sodium gluconate oxidation section.

Description

The gluconic acid sodium salt oxidation section reclaims the method for loss noble metal catalyst

Technical field

The present invention relates to chemical field, particularly a kind of gluconic acid sodium salt oxidation section reclaims the method for loss noble metal catalyst.

Background technology

Gluconic acid sodium salt oxidation stage production method is: the D/W of mass concentration 35%, in stills for air blowing and the circulating ejector inhaled air mix; By activated carbon supported palladium-carbon catalyst catalytic oxidation, use simultaneously volumetric concentration be in 30% the NaOH with control pH value, control reaction temperature 50 degree; Make sodium gluconate solution, in about 4～8 hours of reaction time, wherein activated carbon supported catalyst and water form aaerosol solution; But in chemical process, often there is following problem in the oxidation technology part: a large amount of air part of oxygen that circulating ejector is brought into are participated in reaction, and remaining most of gas solubility in solution is very low; Reaction heat release simultaneously, a part is taken out of by emptying gas, and activated carbon supported density of catalyst is little; Particle is trickle; Do not dissolve with water, cause by the effusion air and take a part out of, thereby cause the loss of catalyst and the pollution of environment; After long-time, the catalyst decrease in efficiency, inversion rate of glucose reduces; Reaction time prolongs even catalytically inactive, and catalyst must upgrade in time, the corresponding unit product catalyst consumption that improved; Improved production cost, palladium catalyst is a noble metal catalyst, and is expensive; The recovery of palladium-carbon catalyst and second use have important meaning to reducing the gluconic acid sodium salt production cost, and therefore, the improvement of gluconic acid sodium salt oxidation section and innovation are the problems of needing solution at present badly.

Summary of the invention

To above-mentioned situation; For solving the defective of prior art, the present invention's purpose just provides the method that a kind of gluconic acid sodium salt oxidation section reclaims the loss noble metal catalyst, can effectively solve catalyst loss in the production process; Environmental pollution, the problem that production cost is high.

The technical scheme that the present invention solves is may further comprise the steps: 1, the circulating ejector by driven by motor mixes with the D/W of mass concentration 35% in the stills for air blowing through air inlet suction air, by activated carbon supported palladium-carbon catalyst catalytic oxidation; 2, in stills for air blowing, the oxidized tail gas behind catalytic oxidation gets into the emptying trunk line by the gas outlet, is pumped to the air tail gas absorber by the axial flow blower on the emptying trunk line; 3, the water that the water circulating pump that links to each other with the absorption tower that absorbs air tail gas extracts in the water tank of bottom in the absorption tower supplies spray head that air tail gas is sprayed, and the active filler that is used for dust-absorbing filtering is housed below the spray head in the absorption tower, purifies air; 4, the circulation of the water behind the spray is recycled to water tank; Air in the oxidized tail gas behind the spray is discharged through the exhaust port at top, absorption tower; Mix the discharging opening sedimentation enrichment of the activated carbon granule of palladium-carbon catalyst through the bottom, absorption tower in the oxidized tail gas, regularly catalyst regeneration system is delivered in discharging.

The present invention can effectively reclaim catalyst, reduces environmental pollution, reduce production costs, and be the innovation of gluconic acid sodium salt oxidation section.

Description of drawings

Fig. 1 is a recovery process chart of the present invention.

The specific embodiment

Do further explain below in conjunction with the accompanying drawing specific embodiments of the invention.

Provide by Fig. 1, the present invention includes following steps:

1.. it is that 35% D/W mixes that the circulating ejector 2 that is driven by motor 3 sucks mass concentration in air and the stills for air blowing 1 through air inlet 4, by activated carbon supported palladium-carbon catalyst catalytic oxidation;

2.. in stills for air blowing 1, the oxidized tail gas behind catalytic oxidation gets into emptying trunk line 6 by gas outlet 5, is pumped to air tail gas absorber 8 by the axial flow blower on the emptying trunk line 67;

3.. below the 9 pairs of air tail gas sprays of water confession spray head in the water circulating pump 11 extraction absorption towers 8 that link to each other with the absorption tower 8 that absorbs air tail gas in the water tank 12 of bottom, spray head 9 active filler 15 that is used for dust-absorbing filtering is housed in absorption tower 8, purifies air;

4.. the water circulation behind the spray is recycled to water tank 12; The exhaust port 13 at 8 tops through the absorption tower of the air in the oxidized tail gas behind the spray is discharged; Mix the discharging opening 14 sedimentation enrichments of activated carbon granule 8 bottoms of palladium-carbon catalyst in the oxidized tail gas through the absorption tower; Regularly catalyst regeneration system is delivered in discharging.

Described water tank 12, water circulating pump 11, spray head 9 and add water tower 10 and form the tail gas absorption systems; Water circulating pump 11 is connected with water tank 12 and spray head 9 respectively through pipeline; Be equipped with on the pipeline between water tank 12 and the water circulating pump 11 and add water tower 10, be used for moisturizing in water tank 12.

The present invention uses through test, has obtained good effect, compared with prior art, has following contribution:

(1) calculates to produce 30000 tons of gluconic acid sodium salts per year; Year needs palladium-carbon catalyst 5500KG～6000KG; Reclaim catalyst recovery system year and account for 2.5% of catalyst total amount, Metal Palladium content in catalyst is about 2%, about 50 yuan/gram of Metal Palladium price; About 150,000 yuan of year recovery value, reclaiming operating cost mainly is that the electricity charge drop into about 30,000 yuan;

(2) this way of recycling reclaims the useful catalyst dust in the air tail gas, tail gas particle organic efficiency about 95%, and it is higher to reclaim quality;

(3) social benefit is obvious, greatly reduces the air-borne dust black pollution, has purified production environment, has improved the worker health degree, killing three birds with one stone.

Claims

1. the method for a gluconic acid sodium salt oxidation section recovery loss noble metal catalyst is characterized in that, may further comprise the steps:

1.. the circulating ejector (2) that is driven by motor (3) mixes with the D/W of mass concentration 35% in the stills for air blowing (1) through air inlet (4) suction air, by activated carbon supported palladium-carbon catalyst catalytic oxidation;

2.. in stills for air blowing (1), the oxidized tail gas behind catalytic oxidation gets into emptying trunk line (6) by gas outlet (5), is pumped to air tail gas absorber (8) by the axial flow blower (7) on the emptying trunk line (6);

3.. the water in the water tank (12) of water circulating pump (11) the extraction interior bottom, absorption tower (8) that links to each other with the absorption tower (8) that absorbs air tail gas supplies spray head (9) that air tail gas is sprayed; Below the spray head (9) active filler (15) that is used for dust-absorbing filtering is housed in absorption tower (8), purifies air;

4.. the water circulation behind the spray is recycled to water tank (12); The exhaust port (13) at (8) top through the absorption tower of the air in the oxidized tail gas behind the spray is discharged; Mix discharging opening (14) the sedimentation enrichment of activated carbon granule (8) bottom of palladium-carbon catalyst in the oxidized tail gas through the absorption tower; Regularly catalyst regeneration system is delivered in discharging.

2. gluconic acid sodium salt oxidation section according to claim 1 reclaims the method for loss noble metal catalyst; It is characterized in that; Described water tank (12), water circulating pump (11), spray head (9) and add water tower (10) and form the tail gas absorption system; Water circulating pump (11) is connected with water tank (12) and spray head (9) respectively through pipeline, is equipped with on the pipeline between water tank (12) and the water circulating pump (11) and adds water tower (10), is used for moisturizing in water tank (12).