CN104986741A - Method for purifying nitrogen prepared from air - Google Patents

Abstract

The invention relates to a method for purifying nitrogen prepared from air, and belongs to the field of gas purification. By aiming at the problems that after the nitrogen preparation from ordinary air, the purification of the nitrogen gas is low, and the pure nitrogen gas cannot be obtained, the method comprises the following steps that through the air compression, moisture removal and molecular sieve selection for air impurity adsorption, coarsely prepared nitrogen gas is introduced into gasified mixed gas of acetic acid, N-ethylenediamine, sodium hydroxide and sulfanilic acid; temperature rise and pressurization are carried out; the gas is introduced into a diluted hydrochloric acid solution for impurity removal, and enters a colored silica gel column to be dried; the nitrogen gas with the purification rate being higher than 99 percent is obtained.

Description

A kind of air-making nitrogen method of purification

Technical field

The present invention relates to a kind of air-making nitrogen purification method, belong to purification field.

Background technology

Nitrogen is a kind of parent of colorless and odorless under usual state, and nontoxic, is the main component of air; The purposes of nitrogen is comparatively extensive, in chemical industry synthesis, be mainly used in synthetic ammonia, is also the important source material with synthon, synthetic resins and synthetic rubber etc. simultaneously, and nitrogen is also a kind of nutritive element is commonly used to make chemical fertilizer; The chemical property of nitrogen is inertia, and common-use words, as shielding gas, enter melon and fruit, food, and gas filled by bulb, oxidized in atmosphere to prevent object from exposing; Nitrogen is applied in automobile industry, stability and the comfortableness of tire form can be improved, weave and blow out and deficency stone roller row, extend Using Life of Tyre, minimizing oil consumption etc.

Along with the expansion that expanding economy and nitrogen are applied, that impels nitrogen technology processed opens method, and the nitrogen gas purity that traditional method is worth is not high, wherein containing other gases a large amount of, so need a kind of new method purify to the nitrogen that air-making obtains and purify.

Summary of the invention

The technical problem that the present invention mainly solves is: on the low side for nitrogen gas purity after normal air nitrogen, the problem of comparatively pure nitrogen cannot be obtained, provide a kind of nitrogen is carried out and filter the method for purifying, significantly add the efficiency that air is purified, ensure that the purity of air-making nitrogen.

For solving the problems of the technologies described above, the technical solution adopted in the present invention is:

(1) 5m is got ³air compresses, and compression volume is to 2.5m ³, cooling is carried out freezing, passes into the vitriol oil simultaneously and carries out drying, removes moisture;

(2) air compressed is screened, carry out selective adsorption by carbon molecular adsorbent, remove the impurity in most of air, obtain purer crude nitrogen;

(3) above-mentioned crude nitrogen is passed in the mixed gas of vaporization, carry out being warming up to 80 ~ 100 DEG C after passing into completely, after pressurization intensification 20 ~ 40min, remove heating, decompression;

(4) gas cooling to be mixed is to room temperature, in reaction unit, add palladium catalyst, is warming up to 240 DEG C, proceeds reaction;

(5) mixed gas reacted completely is passed in dilute hydrochloric acid solution carry out removal of impurities, pass into after removal of impurities in coloured silicagel column and carry out drying, obtain pure nitrogen.

Described mixed gas be acetic acid, hydrochloride naphthodiamide, sodium hydroxide and Sulphanilic Acid mixed gas, the ratio of gas volume is 3:2:2:3, with toluene dissolve heat up vaporization.

Principle of the present invention is: first carry out Adsorption by the vitriol oil to the water vapour in air, is at high temperature reacted with different gas by different reagent simultaneously, removes other gases except nitrogen, obtains comparatively pure nitrogen.

The invention has the beneficial effects as follows: simple to operate, purity is high, after purification but its concentration can reach 99.9%, and obtained nitrogen

Gas low price, production operation is simple, and suitability is wide.

specific embodiments:

Get 5m ³air compresses, and compression volume is to 2.5m ³, cooling is carried out freezing, passes into the vitriol oil simultaneously and carries out drying, removes moisture; The air compressed is screened, carries out selective adsorption by carbon molecular adsorbent, remove the impurity in most of air, obtain purer crude nitrogen; Above-mentioned crude nitrogen is passed in the mixed gas of vaporization, carries out being warming up to 80 ~ 100 DEG C after passing into completely, after pressurization intensification 20 ~ 40min, remove heating, decompression; Gas cooling to be mixed, to room temperature, adds palladium catalyst in reaction unit, is warming up to 240 DEG C, proceeds reaction; The mixed gas reacted completely is passed in dilute hydrochloric acid solution and carries out removal of impurities, pass into after removal of impurities in coloured silicagel column and carry out drying, obtain pure nitrogen.

Get 5m ³air compresses, and compression volume is to 2.5m ³, cooling is carried out freezing, passes into the vitriol oil simultaneously and carries out drying, removes moisture; The air compressed is screened, carries out selective adsorption by carbon molecular adsorbent, remove the impurity in most of air, obtain purer crude nitrogen; Above-mentioned crude nitrogen is passed in the mixed gas of vaporization, carries out being warming up to 80 DEG C after passing into completely, after pressurization intensification 20min, remove heating, decompression; Gas cooling to be mixed, to room temperature, adds palladium catalyst in reaction unit, is warming up to 240 DEG C, proceeds reaction; The mixed gas reacted completely is passed in dilute hydrochloric acid solution and carries out removal of impurities, pass into after removal of impurities in coloured silicagel column and carry out drying, obtain pure nitrogen, the present invention is simple to operate, purity is high, after purification but its concentration can reach 99.9%, and obtained nitrogen low price, production operation is simple, and suitability is wide.

Claims (2)

1. an air-making nitrogen method of purification, is characterized in that concrete operation step is:

(1) 5m is got ³air compresses, and compression volume is to 2.5m ³, cooling is carried out freezing, passes into the vitriol oil simultaneously and carries out drying, removes moisture;

(2) air compressed is screened, carry out selective adsorption by carbon molecular adsorbent, remove the impurity in most of air, obtain purer crude nitrogen;

(3) pass in the mixed gas of vaporization by above-mentioned crude nitrogen, carry out being warming up to 80 ~ 100 DEG C after passing into completely, pressurization intensification removes heating in 20 ~ 40 minutes later, decompression;

(4) gas cooling to be mixed is to room temperature, in reaction unit, add palladium catalyst, is warming up to 240 DEG C, proceeds reaction;

(5) mixed gas reacted completely is passed in dilute hydrochloric acid solution carry out removal of impurities, pass into after removal of impurities in coloured silicagel column and carry out drying, obtain pure nitrogen.

2. a kind of air-making nitrogen method of purification according to claims 1, it is characterized in that: described mixed gas be acetic acid, hydrochloride naphthodiamide, sodium hydroxide and Sulphanilic Acid mixed gas, the ratio of gas volume is 3:2:2:3, dissolves with toluene the vaporization that heats up.