SU1530634A1 - Liquid heat carrier - Google Patents

Abstract

The invention relates to heat transfer substances and can be used as a heat transfer fluid in tubular fuel gas preheaters in gas compressor stations. The aim of the invention is to reduce the corrosivity of a heat carrier to ferrous metals. The goal is achieved by using a heat transfer fluid including glycol, alkanolamine, water, and a mannich phenolic base of the general formula @, where R is alkyl or isoalkyl C ₆ -C ₂₁

X - H or - (CH ₂ CH ₂ O) _Y H (Y = 1-12) in the following ratio, wt.%: Glycol 30-70

alkanolamine 0.01-10.00

Mannich phenolic base 0.01-0.10

water - the rest. 3 tab.

Description

The invention relates to heat transfer agents that can withstand cooling to low temperatures without freezing and have low corrosivity to ferrous metals, and can be used as a heat transfer fluid in tubular fuel gas preheaters at gas compressor stations.

The aim of the invention is to reduce the corpusive activity of the heat carrier to ferrous metals.

Example. Fluids of the compositions listed in Table 1 are prepared by blending the components.

Table 1 summarizes the comparative tests of mono-ethylamine, FOM-9 (phenolic Mannich bases with R - (in based on propylene trimer) and a mixture of monoethanolamine and Ф011-9. The tests were carried out in aqueous solution of diethylene glycol at 90 ° C. Test duration 100 h

As can be seen from the test results (Table 1), FOM-9 in the liquid phase is a more effective corrosion inhibitor than monoethanolamine. The effect will increase significantly with the combined use of FOM-9 and monoethanolamine.

Heat carriers containing 0.01– 0.1 wt.% FOM-9 and 0.1–10 wt.% Alkasd

00

about

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from 1

3

nolamines, have gzkoy corrosive aggressiveness. ytvinviueHi-e concentration above the specified limits is impractical for economic reasons, and a decrease in the concentration below the specified limits leads to an increase in corrosivity.

KopposviOHHoft differences in the aggressiveness of antifreeze containing monoethanolamine alone and its combination with POF are particularly pronounced during long-term corrosion tests, as illustrated by the data in Table 2,

As can be seen from the data of Table 2, when using a known coolant, significant (over 0.05 mm / year) corrosion rates are observed after 200 hours of testing, whereas with the simultaneous introduction of monoethanolamine and FOM-9, low values of corrosion rates are observed over 1000 hours

Table 3 presents the results of the influence of the FOL structure on the corrosivity of the standard liquid heat dissipation composition: containing 60% diethylene glycol, 0.1% monoethe- pamine-amine, and 0.01% POF. The tests were carried out at 90 ° C, their duration was 100 hours. The samples were carbon steel.

As can be seen from the averaged data, the change in the structure of the POF i. the proposed limits, allows in all cases to obtain coolants with pop corrosive rs-ressivis Stew,

te15306344

The proposed heat transfer fluid can be used for suryiTU g & heaters in gas transmission installations in the northern regions of the country.

Claims (1)

Invention Formula A heat transfer fluid, including glycol, alkanolamine and water, characterized in that, in order to reduce corrosivity to ferrous metals, it additionally contains a Mannich phenolic base of the general formula CH / 2CH2CH2N (CH5) 2 OHCH2CH2CH2N1CH5) 2 where r x -alkyl or isoalkyl Cg-C,; - hydrogen shsh - (CH ,, CH, 0) OH (), in the following ratio, wt.%: Glycol 30-50 Alkanolamine 0.01-10.00 Phenolic base Mannich specified formula 0.01-0.10 Water Rest Ltd 0.01 0.1  one 0.1 0.1 0.15 0.07 0.08 0.04 0.03 0.02 0.02 0.01 0, I1 0,018 0.016 0.06 0.02 0.0009 0,0010 0.001 R ) 0.010 8.5 0.003 8.50.0058.0 0.006 - 0.008 0.02 0.02 (known) 0.065 8.00.01 6.50.19 5.50.34 5, L 0.52 0.96 Ethylene glycol 60Z, monoethanolamine 0.01%, Mannich phenolic base 0.01%, water - the rest. Ethylene glycol 60%, monoethanolamine 0,014%, water - the rest. T a l C a Table