CN103305850B - Gas phase antiseptic for shutdown and standby equipment - Google Patents

Abstract

The invention relates to a gas phase antiseptic for shutdown and standby equipment. The gas phase antiseptic is prepared by successively mixing an ethylenediaminetetraacetic acid diammonium salt, ammonium carbamate, ammonium citrate, ammonium bicarbonate, ammonium sulfamate and amino trimethylene phosphonic acid in proportion in a drying and drafty environment with a temperature of 20 to 25 DEG C and carrying out continuous stirring for 5 to 10 min until the above-mentioned components are uniformly mixed; and slowly adding a mixture obtained in the previous step into a dodecylbenzene sulfonic acid triethanolamine salt and hydroxyethylidene diphosphonic acid in proportion with stirring and continuing stirring for 10 to 20 min so as to prepare the gas phase antiseptic. Compared with a traditional protection method, the gas phase antiseptic provided by the invention has the characteristics of convenient construction and usage, safety, long-acting efficiency, a good protection effect, low cost and the like.

Description

Stop stand-by facilities vapor-phase inhibitors and preparation method thereof

Technical field

The present invention relates to a kind of sanitas, is a kind of at the vapor-phase inhibitors of stopping using, suppression equipment is corroded between standby period specifically.

Background technology

Due to the adjustment of the production program, there will be part, not have the equipment of weather-resistance to stop work idle or for subsequent use, to be producedly enables when needing again.Practice shows; these do not have the corrosion of the equipment of weather-resistance between lay-up period much more serious than run duration; if do not taked sfgd., large-scale corrosion or perforation can be there is, causing equipment to reactivate difficulty even premature failure and cause great financial loss.

Existing rust-proofing method, has requirement and restriction, poor stability to the size of proterctive equipment and size, structure, condition of surface, has leakage, and to environment, the protection time limit is short.

Summary of the invention

In order to solve equipment between equipment out of use, standby period due to the financial loss that atomospheric corrosion is brought, one is the object of the present invention is to provide to stop stand-by facilities vapor-phase inhibitors.Vapor-phase inhibitors are used for idle unit protection, compared with traditional guard method, there is construction and enable convenience, safety and effectivity, the feature such as protected effect is good, expense is lower, thus day by day come into one's own, become one of main method that idle unit protects.

The object of the present invention is achieved like this:

One stops stand-by facilities vapor-phase inhibitors, it is characterized in that being made up of following materials:

Witco 1298 Soft Acid triethanolamine salt 1% ~ 10%;

Ethylenediamine tetraacetic acid (EDTA) di-ammonium salts 5% ~ 20%;

Ammonium carbamate 20% ~ 35%;

Ammonium citrate 10% ~ 20%;

Bicarbonate of ammonia 20% ~ 35%;

Ammonium sulfamate 5% ~ 10%;

Hydroxy ethylene diphosphonic acid 1% ~ 3%;

Amino Trimethylene Phosphonic Acid 3% ~ 10%.

Prepare the method for above-mentioned vapor-phase inhibitors, the steps include:

20 DEG C ~ 25 DEG C dryings and successively ethylenediamine tetraacetic acid (EDTA) di-ammonium salts, ammonium carbamate, ammonium citrate, bicarbonate of ammonia, Ammonium sulfamate, Amino Trimethylene Phosphonic Acid are mixed according to the above ratio under draughty environment and Keep agitation 5 ~ 10 minutes to evenly; Said mixture is slowly added Witco 1298 Soft Acid triethanolamine salt and hydroxy ethylene diphosphonic acid more in proportion when stirring, and Keep agitation made vapor-phase inhibitors after 10 ~ 20 minutes.

That need protect stops (standby) protection mechanism with equipment vapor-phase inhibitors:

Stop (standby) that need protect is development according to equipment protection and neutralization technology and the product innovation succeeded in developing with equipment vapor-phase inhibitors, this product the equipment such as Industrial Boiler, tower, still, boat, tank, pipe network, interchanger and pressurized vessel stop (standby) with during can play effective corrosionproof protection and derusting action.Need protect stop (standby) with equipment vapor-phase inhibitors be a kind of vapour-phase inhibitor it be made up of volatile rust inhibition material and chelating rust remover and various additive, automatically can volatilize at normal temperatures and pressures and there is rust inhibition, sequestering and alkaline gas.(1) rust inhibition gas is by the stable chemisorption of nitrogenous polar group formation; firmly be adsorbed on the metallic surface of protected equipment; form fine and close protective membrane; the contact of the isolated corrosive medium such as air, water vapour and metallic matrix; thus reach available protecting equipment, prevent or the object of the atomospheric corrosion equipment that slows down.(2) sequestering gas has stronger perviousness and metal ion chelating capacity, for the equipment got rusty, below this gas-permeable to rusty scale, chelated metal ions prevents further corrosion, also can be peeled off and the original rusty scale of chelating remove portion by infiltration.(3) alkaline gas can provide the space environment thus the galvanic corrosion alleviating equipment surface that need the alkalescence of proterctive equipment inside.

Stop (standby) that need protect inherently has inhibiter with equipment vapor-phase inhibitors solid and soluble in water, and its aqueous solution also also has inhibition preservative activity to equipment.

The beneficial effect of advantage of the present invention and generation:

1, automatically can volatilize at normal temperatures, there is higher vapour pressure.The gas evaporated has corrosion inhibition to metal, thus reaches the object of corrosionproof protection.

2, there is stronger perviousness, original dirty layer can be peeled off.Prevent and the underdeposit corrosion that slows down.The space environment thus the galvanic corrosion alleviating equipment surface that need the alkalescence of proterctive equipment inside can be provided.

3, infiltration can be played to the equipment of corrosion to peel off and chelating, can the original rusty scale of remove portion, play certain derusting action.

4, can metallic surface be protected, inner metallic layer (as long as the place that volatile gases can arrive all can play a protective role) under top layer can be protected again.

5, soluble in water, therefore can not take out sanitas at the end of Shut-down Protection, can feed intake after water flushing production.

6, the present invention can be used for the protection of the complete or individual equipment of chemical industry, oil refining industry stopping using, between standby period, the traditional methods such as alternative siccative, nitrogen filled protection, economy, safety, convenience, save time, laborsaving, efficient.

7, the present invention compares (see table 1) with general rust-proofing method relative merits:

Table 1

As can be seen from Table 1: the requirement utilizing the size of vapor phase inhibitor proterctive equipment and size, structure, condition of surface undue and restriction, contrast with general rust-proofing method, have easy construction, safety, the feature of protection year limit for length.

Accompanying drawing explanation

Fig. 1 be add vapor-phase inhibitors examination 720h after schematic diagram.

Fig. 2 be do not add vapor-phase inhibitors examination 720h after schematic diagram.

Fig. 3 adds vapor-phase inhibitors reservoir walls (after half a year) schematic diagram.

Fig. 4 does not add vapor-phase inhibitors reservoir walls (after half a year) schematic diagram.

Embodiment

Below in conjunction with embodiment, then technical scheme of the present invention is further described:

Embodiment 1:

Successively 5g ethylenediamine tetraacetic acid (EDTA) di-ammonium salts, 35g ammonium carbamate, 10g ammonium citrate, 35g bicarbonate of ammonia, 10g Ammonium sulfamate, 3g Amino Trimethylene Phosphonic Acid are mixed in protective material orchestration according to the above ratio under draughty environment 20 DEG C ~ 25 DEG C dryings, and Keep agitation 5 ~ 10 minutes is to evenly.Said mixture is slowly added 1g Witco 1298 Soft Acid triethanolamine salt, 1g hydroxy ethylene diphosphonic acid in proportion when stirring, and namely Keep agitation made vapor-phase inhibitors after 10 ~ 20 minutes.

Test example

1, corrosion test test piece (20# steel) processes by the regulation of HG/T3523;

2, blank corrosion test (not adding the test of vapor-phase inhibitors)

In the 1000ml wide-necked bottle cleaned up, add the clear water of 50ml, will handle well and be suspended in the gas phase in wide-necked bottle through the test piece 1 that ten thousand/balance is weighed, sealing bottleneck.

3, through the corrosion test of vapor-phase inhibitors protection

Take the protective material sample of about 15g, put into 50ml small beaker; Be placed on by small beaker bottom 1000ml wide-necked bottle, rim of a cup should exceed the liquid level in wide-necked bottle again; Other are with 2.

4, test period: 720h.

5, test temperature: 30 ± 1 DEG C (water bath with thermostatic control heating).

6, preservative efficiency

Table 2 blank test with add the rotten agent Experimental Comparison of anti-gas phase

As can be seen from Table 2: after blank test experiment, coupon weight is than the heavy 0.176g of coupon weight before blank test experiment, the generation of rust staining is described and increases the weight of the weight of test piece; And adding the rotten agent of anti-gas phase, test piece increases the weight of 0.001g, and preservative efficiency is 99.4%.

Preservative efficiency calculates and is undertaken by formula below.

ω＝ΔG/(s·t) -----------------------------------------------(1)

η＝(ω ₀-ω ₁)/ω ₀×100％ ------------------------------------------------(2)

Formula (1) is substituted into formula (2) and obtains formula (3):

η＝(ΔG ₀-ΔG ₁)/ΔG ₀×100％ -----------------------------------------------(3)

In above formula:

Δ G ₀the difference of the quality of------blank test test piece before corrosion and after corrosion, g;

Δ G ₁------adds the difference of the quality of vapor-phase inhibitors test piece before corrosion and after corrosion, g;

The s----------test piece total area, m ²;

The t----------corrosion test time, h;

ω ₀the erosion rate of-------test piece blank test, g/m ².h

ω ₁-------try the erosion rate under protective condition, g/m ².h;

η--------preservative efficiency, %.

Drawn by (3) formulae discovery:

η＝(ΔG ₀-ΔG ₁)/ΔG ₀×100％

η＝{(14.498-14.331)-(14.126-14.125)}/(14.498-14.331)×100％

η＝(0.167-0.001)/0.167×100％

η＝99.4％

In sum, after experiment 720h, contrast (see Fig. 1, Fig. 2) of taking pictures has been carried out in the test piece adding vapor-phase inhibitors and do not add vapor-phase inhibitors.Fig. 1 adds vapor-phase inhibitors for stopping for period equipment, and test piece light is as new; Fig. 2 does not add vapor-phase inhibitors for stopping standby period, and test piece has rusty stains.Fig. 1 display stops the effect that standby equipment adds vapor-phase inhibitors generation.

Embodiment 2:

Successively 15kg ethylenediamine tetraacetic acid (EDTA) di-ammonium salts, 30kg ammonium carbamate, 10kg ammonium citrate, 30kg bicarbonate of ammonia, 10kg Ammonium sulfamate, 3kg Amino Trimethylene Phosphonic Acid are mixed in protective material orchestration according to the above ratio under draughty environment 20 DEG C ~ 25 DEG C dryings, and Keep agitation 5 ~ 10 minutes is to mixing.Said mixture is slowly added 1kg Witco 1298 Soft Acid triethanolamine salt, 1kg hydroxy ethylene diphosphonic acid in proportion when stirring, and namely Keep agitation made vapor-phase inhibitors after 10 ~ 20 minutes.

Above-mentioned vapor-phase inhibitors are put into 100 cubic metres of storage tanks that certain petro-chemical corporation is for subsequent use, vapor-phase inhibitors add-on adds 1kg calculating by every cubic metre of space and altogether adds 100kg, and the protection period is half a year.After half a year, contrast of taking pictures has been carried out to the storage tank of the same model adding vapor-phase inhibitors and do not add vapor-phase inhibitors, add the reservoir walls of stopping stand-by facilities vapor-phase inhibitors and still keep metal true qualities (see Fig. 3), and do not add the reservoir walls of stopping vapor-phase inhibitors for subsequent use and have rusty stains (see Fig. 4).

Claims (2)

1. stop stand-by facilities vapor-phase inhibitors, it is characterized in that being made up of following materials:

Witco 1298 Soft Acid triethanolamine salt 1% ~ 10%;

Ethylenediamine tetraacetic acid (EDTA) di-ammonium salts 5% ~ 20%;

Ammonium carbamate 20% ~ 35%;

Ammonium citrate 10% ~ 20%;

Bicarbonate of ammonia 20% ~ 35%;

Ammonium sulfamate 5% ~ 10%;

Hydroxy ethylene diphosphonic acid 1% ~ 3%;

Amino Trimethylene Phosphonic Acid 3% ~ 10%.

2. prepare the method for vapor-phase inhibitors described in claim 1, the steps include:

20 DEG C ~ 25 DEG C dryings and successively ethylenediamine tetraacetic acid (EDTA) di-ammonium salts, ammonium carbamate, ammonium citrate, bicarbonate of ammonia, Ammonium sulfamate, Amino Trimethylene Phosphonic Acid are mixed according to the above ratio under draughty environment and Keep agitation 5 ~ 10 minutes to evenly; Said mixture is slowly added Witco 1298 Soft Acid triethanolamine salt and hydroxy ethylene diphosphonic acid more in proportion when stirring, and Keep agitation made vapor-phase inhibitors after 10 ~ 20 minutes.