KR850001732B1 - Non phosphours compound for preventing scale - Google Patents

Abstract

This composition helps to prevent scaling in boilers. This non- phosphorus composition consists of 20-80 wt. pts. sodium boric acid, 10-60 wt. pts. ethylenediamine tetraacetic acid deriv., 1-15 wt. pts. anion surface active agent, 0.2-20 wt. pts. molybdenum deriv. and 1- 20 wt. pts. tannin deriv. The sodium boric acid was the anhydride. This composition prevents scale in boilers and is an effect active anti-corrosive agent.

Description

Non-phosphate-based capstone composition

)에 사용되는 조성물에 관한 것이다.The present invention prevents and removes the capstone that is generated and bound inside the various boilers, and prevents the rust inside the boiler (

It relates to a composition used for).

In more detail, the composition of the present invention is for preventing, removing, and corrosion of capstone formed in various industrial boilers, heating boilers, engine boilers, etc. of a vessel, and sodium borate, ethylenediamine tetraacetic acid derivative, and anion. It is a non-phosphate composition which consists of surfactant, a molybdenum derivative, and a tannin derivative.

Conventional capstone prevention, removal and corrosion inhibiting compositions are as described in Patent Application No. 82-744, which is a prior application of the present inventors. It was recognized that the composition of the patent application No. 82-744 was excellent, but did not completely eliminate the defects contaminating the water due to the use of phosphate, and the chromium agent commercially available in the United States is not only limited to low pressure boilers, When used in soft water of less than 5ppm total water hardness, it is possible to obtain the effect of removing the capstone, and did not obtain the satisfactory effect. Moreover, when the phosphate-based or chromium-based wastewater is mixed with rivers or seawater, it causes red tide and kills fish and shellfish. In addition, the "hydro unit" and "E. double U tee" (EWT) imported from foreign countries as a capstone prevention device are very expensive and they actually help to prevent capstones as a result of installation in industrial boilers. It was found that the capstone was formed, and also had no effect on the existing capstone.

The present inventors in order to solve the drawbacks of these various phosphate derivatives I chromium research in order derivative is to develop a non-containing formulation, a review, sodium borate, ethylenediaminetetraacetic acid derivatives (EDTA, H ₄ Y) anionic surfactants, molybdenum derivative As a result of using a mixture of tannin derivatives in a certain ratio, it was found that the above-mentioned defects acted as an excellent customs and cleansing agent, which led to the present invention.

The ratio of the composition used herein may vary depending on the hardness of the water used, but is within the range described below when based on Korean industrial water.

Sodium borate used in the above is preferably used to make an anhydride. The sodium borate has an alkalinity increase, anti-scaling effect, softening and hardening of hard water, and does not react with the capstone forming factor. The amount used is 20-80 parts by weight, preferably 30-70, based on the total weight of the composition. Parts by weight, more preferably 35-50 parts by weight. As said ethylenediamine tetraacetic acid derivative, the alkali or tetraalkali salt of ethylenediamine tetraacetic acid is preferable.

These ethylenediaminetetraacetic acid derivatives form stable chelate compounds with alkaline earth metal ions, circuitry metal ions, transition metal ions, etc., thus preventing the formation of ions by the blocking action of ions of the capstone forming components and the softening of hard water. Acts as. The amount of these compounds used is 10-60 weight parts, preferably 20-50 weight parts, and more preferably 30-40 parts by weight relative to the total weight.

There are various kinds of the anionic surfactant, but it does not cause bubbles in water, and preferred examples thereof include lignin sulfonate, which shows water softening, capstone formation prevention, corrosion prevention, caustic dropping, and dispersion effect. Its usage amount is 1-15 parts by weight, more preferably 3-9 parts by weight based on the total weight.

When foaming occurs in the boiler water, it is preferable to add a known antifoaming agent such as silicone oil to the composition of the present invention.

Examples of the molybdenum derivatives include molybdenum phosphate, molybdate and molybdenum ammonium, with molybdenum and molybdenum ammonium being particularly preferred. These molybdenum derivatives are thought to act as lubrication, catalyst, infiltration, and capstone decomposition. Among them, molybdenum ammonium is preferred for prevention of capstone, and molybdate is preferred for removal of capstone. Parts, preferably 4-10 parts by weight.

Tannin derivatives include tannic acid, pyrogarol, quebracho, and the like. Among these, pyrogarol is more effective at removing the capstone, and quebracho is preferable for prevention. It is believed that these deoxygenation and decarbonization, dialysis prevention, alkalinity adjustment, and corrosive effect are used, and their amount is 1-20 parts by weight, preferably 4-10 parts by weight based on the total weight.

As described above, the component ratio of the composition of the present invention may vary depending on the difference in the water quality used and the components of the capstone, and the scope of the present invention is not limited to the use examples described below.

Example 1

45 parts by weight of sodium borate anhydride┃ 8 parts by weight of molybdate

15 parts by weight of ethylenediaminediacetic acid disodium ┃ 8 parts by weight of lignin sulfonate

20 parts by weight of ethylenediaminetetraacetate tetrasodium 4 parts by weight pyrogarol

The magnetic boiler attached to the industrial boiler (connected 5 ton boiler) in Suwon-si was attached and operated for about 1 year.The result was 4-5mm capstone attached and absent. As a result, there were many components of silicate and sulfate. It was pickled and removed but could not be removed. The capstone of these components can be washed with hydrofluoric acid, but this could not be done because of the danger of construction and the erosion of the boiler body.

The composition was added to the boiler by adding 50 g per ton of water and operated for about 1 month. After opening, it was confirmed that the originally bound white capstone turned into black brown, dissolved and decomposed to be eliminated. It is evident that the composition of the present invention has penetrated, degraded, and removed dark brown. After another two months, the boiler was completely removed.

Example 2

50 parts by weight of sodium borate anhydride ┃ 8 parts by weight of lignin sulfonate

20 parts by weight of ethylenediaminetetraacetic acid disodium ┃ 8 parts by weight pyrogarol

10 parts by weight of ethylenediaminetetraacetic acid tetrasodium ┃ molybdate 4 parts by weight

It was confirmed that the composition was removed and put into operation for about three months in a water pipe-type 5-ton boiler (a mother factory in Daegu City) where capstone was absent in the water quality of 250 ppm of water.

Example 3

Sodium borate 55 parts by weight ┃Quebracho 4 parts by weight

Ethylenediaminetetraacetic acid tetrasodium 30 parts by weight ┃ molybdenum ammonium 4 parts by weight

Lignin sulfonate 7 parts by weight

Although the total phosphate capping agent was used in the associated 5 ton boiler of the parent factory in Anyang-si, Gyeonggi-do, which uses industrial water of 90 ~ 110ppm water quality and turbidity of 6NTU water quality, the phosphate capping agent was used. Since the pH was lower than the standard value, the hydrogen ion concentration did not increase even when the amount of the cleansing agent was increased.

It was turbidity 6NTU that the hydrogen ion concentration could not be adjusted by the input of the general capstone inhibitor, when the non-patent general phosphate capstone inhibitor is used in the water quality due to the turbidity of the water and the water flow along with the pump .

When the above-described composition was added, the pH was raised to pH 10 or higher and continued. The composition was added to 15 g per ton of water and used for one month and then opened and confirmed. Part of the attached capstone was removed, and a brownish brown film was formed on the removed iron tube surface, and the capstone was not bound after the composition was used.

The composition was added to the 10-ton boiler in Busan, which uses water with a water hardness less than 10 ppm, and added 5 g per ton of water and operated for one month.

In addition, the composition was added to 4g per ton of water in a 20-ton high-pressure boiler at a Gumi industrial dyeing factory, and after one month of use, an overview of the existing capstone was removed and no capstone was attached.

Claims (5)

For boilers comprising 20 to 80 parts by weight sodium borate, 10 to 60 parts by weight ethylenediaminetetraacetic acid derivative, 1 to 15 parts by weight anionic surfactant, 0.2 to 20 parts by weight molybdenum derivative and 1 to 20 parts by weight tannin derivative Non-Phosphate Dialysis Prevention and Removal Composition. The composition according to claim 1, wherein the sodium borate is composed of 30 to 50 weight ratio. The composition according to claim 1 or 2, wherein the ethylenediaminetetraacetic acid derivative is composed of 30 to 40% by weight. The composition according to claim 1 or 2, wherein pyrogarol or quebracho is composed of 4 to 10 weight ratios as tannin derivatives. The composition according to claim 1 or 2, wherein molybdenum acid or molybdenum ammonium is composed of 4 to 10% by weight as the molybdenum derivative.