MXPA00009962A - Semi-organic multifunctional composition for water treatment with high silica content and corrosive tendencies for white metals, in reserve water of cooling towers. - Google Patents

Abstract

The present invention refers to water soluble composition called IMP-TE-508 which presents an elevated efficiency for water chemical treatment of cooling towers with soluble, colloidal and amorphous high silica content, with corrosive tendencies for white metals as carbon steel, in the reserve water of cooling towers Methane I and II of the petrochemical complex, allowing to work at elevated concentration cycles and maintaining an adequate control of corrosion, incrustation and dispersion in the thermal exchange equipments, preventing the soiling tendency of the process equipments of the multifunctional composition. This technology is considered as a notable advance in the chemical treatment area for reserve water of cooling towers coming from non-treated wells. This technology is composed of a mixture of corrosion inhibitors and a mixture of incrustation and dispersion inhibitors of the polymeric kind with low molecular weight and water-soluble.

Description

MULTIFUNCTIONAL SEMI-REGIONAL COMPOSITION FOR THE TREATMENT OF WATER WITH HIGH SILICA CONTENT AND WITH CORROSIVE TRENDS FOR METALS WHITE, IN THE REPLACEMENT WATER IN COOLING TOWERS.

DESCRIPTION TECHNICAL FIELD OF THE INVENTION The present invention relates to a water soluble composition called IMP-TE-508 which has a high efficiency for the chemical treatment of water from cooling towers with high content of soluble, colloidal and amorphous silica, with corrosive tendencies for white metals as carbon steel, for the replacement water to the cooling towers: Methanol I and II of the Independencia Petrochemical Complex in the State of Puebla, which allows working at high concentration cycles and maintaining an adequate control of corrosion, incrustation and dispersion in the equipment of thermal exchange, avoiding also the tendency to fouling of the equipment of process of the multifunctional product.

The present invention is specific to the chemical treatment for the cooling water to cooling towers from untreated well, which is composed of a mixture of corrosion inhibitors and a mixture of inhibitors of embedding and dispersion of polymeric type of low weight molecular, soluble in water.

BACKGROUND OF THE INVENTION The water used in the cooling towers contains mainly cations, such as calcium, magnesium and soluble silica; colloidal and amorphous which, due to being untreated water, exhibits a greater complexity in its chemical treatment. When these anions and cations are combined in concentrations where the solubility of their reaction products is exceeded, they precipitate. The solubility of the components present varies for the following reasons: concentration of salts, changes in pH, and temperature; as well as by the introduction of additional ions that form insoluble compounds with the ions already present in the solution.

These reaction products precipitate on the surfaces of the cooling system, forming deposits, whose accumulation prevents effective heat transfer, interferes with the flow of water, facilitates corrosive processes and bacterial growth, this being a serious problem in the systems of the cooling towers, since the stops are increased by cleaning and removing deposits.

Likewise, corrosion in heat exchange equipment and interconnection lines increases operating costs due to stoppages and maintenance, which significantly reduces the useful life of the aforementioned equipment.

To avoid the aforementioned problems, zinc-based corrosion inhibitors have been used, and low molecular weight polymers are currently used to prevent fouling and fouling.

As background of the process of this invention, we have the National Patent with file number 203691 related to an inhibiting composition of corrosion inhibitor and dispersant of sludge for cooling tower waters, which was applied in the "General Lázaro Cárdenas" Refinery. in Minatitlán, Ver. and is currently applied in the Independencia Petrochemical Complex, in the State of Puebla.

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a "semi-organic" multifunctional composition for the treatment of cooling water with high content of soluble, colloidal and amorphous silica, in the replacement water in cooling towers Methanol I and II of the Petrochemical Complex Independencia del Estado de Puebla; With the application of this treatment program it is possible to keep under control the problems of corrosion, incrustation and dispersion.

The composition object of the present invention presents a highly satisfactory behavior for the control of corrosion problems in white metals (carbon steel), helping to keep the systems free of fouling and fouling due to the presence of a high content of soluble silica, colloidal and amorphous The IMP-TE-508.1 product contains in its formulation a mixture of corrosion inhibitors, an organic one of the phosphonocarboxylic type and another based on zinc. With the continuous use of this product at dosages in the range of 20 to 50 ppm it is possible to keep under control the corrosion rates for the parts made of carbon steel less than 5 mpa.

The product IMP-TE-508.2 controls the formation of encrusting salts on the metallic surfaces of the cooling systems and the formulation object of the present invention contains a mixture of a derivative of phosphonic type, this effect being reinforced with a mixture of polymers of low molecular weight specific for trace water with high traceable silica content.

The objectives of the present invention are: Provide a completely water-soluble chemical composition that allows satisfactory control of incrustation and corrosion, in cooling water systems with high content of soluble, colloidal and amorphous silica, and with corrosive tendencies for white metals such as carbon steel, in water Refill cooling towers from well, without pretreatment, in the Independencia Petrochemical Complex located in the State of Puebla.

It allows the saving in the consumption of spare water to the cooling towers, up to 30% reaching a greater number of concentration cycles without presenting incrustation and corrosion problems.

• In spare water to cooling towers from wells, without pretreatment containing high concentration of soluble, colloidal and amorphous silica, allows us to keep the high solids content in solution when reaching high concentration cycles, preventing its precipitation and avoiding This form is deposited on metal surfaces, reducing fouling in cooling systems by up to 30%, which it allows to avoid unplanned plant shutdowns, continuing with the production programs and having a significant saving by cleaning in the heat exchange equipment.

• In the present formulation it is possible to obtain a mixture of inhibitors of corrosion that have a synergistic effect, which allows us to obtain corrosion speeds below 1.0 mpa.

The composition of the present invention is presented in the liquid state, divided into two parts with the following composition: IMP-TE- -508.1 COMPONENT% WEIGHT Demineralized water 10-60 Hydroxyphosphate acetic acid 5-40 Monoethanolamine 2-30 Zinc chloride 10-20 IMP-TE-509.2 COMPONENT% WEIGHT Copolymer KT-2800 10-50 Terpolymer KT-7800 10-50 The product IMP-TE-508.1 contains in its formulation from 5 to 40% by weight of hydroxyphosphate acetic acid, used as a corrosion inhibitor, from 2 to 30% by weight of monoethanolamine, from 10 to 20% by weight of 50% zinc chloride and from 10 to 60% by weight of demineralized water.

The product IMP-TE-508.2 contains in its formulation from 10 to 50% by weight of the organic copolymer KT-7800, from 10 to 50% by weight of the organic terpolymer KT-2800, traceable.

The hydroxyphosphonic acetic acid compound present in the formulation promotes the formation of a protective film on metal surfaces, which constitutes a mechanical and electrochemical barrier that passivates the metal against corrosive attack. This film has a high degree of thermal stability and oxidation, so it is not easily removed.

The active component; Hydroxyphosphonic acetic acid of the present invention has the following formula: OH O R OH- P - CH- C ^ OH O The organic copolymer KT-2800 and the organic terpolymer KT-7800, both of low molecular weight, present in the composition object of the invention, work by dispersing the particles that are in solution, inhibiting the precipitation of salts of calcium carbonate and silica as such specifically.

EXAMPLES Example 1 In a 1 liter glass vessel provided with cooling jacket and mechanical stirring, 620 g of demineralized water and 90 g of hydroxyphosphate acetic acid were placed, then 12 g of monoethanolamine were weighed and added while stirring the mixture. 250 g of zinc chloride are then weighed and added to the mixture, stirring is continued until a homogeneous product is obtained, this product has a final pH of 5.7.

Example 2 In a 1 liter glass vessel provided with cooling jacket and mechanical stirring, 650 g of demineralized water and 100 g of hydroxyphosphonic acetic acid were placed, then 10 g of monoethanolamine were weighed and added while stirring the mixture.

Then 230 g of zinc chloride are weighed and added to the mixture, stirring is continued until a homogenous product is obtained, this product has a final pH of 5.5 Example 3 In a 1 liter glass vessel provided with cooling jacket and mechanical stirring, 625 g of demineralized water and 110 g of hydroxyphosphonic acetic acid were placed, then 14 g of monoethanolamine were weighed and added while stirring the mixture.

Then weigh 245g of zinc chloride and add to the mixture, continue stirring until a homogeneous product, this product has a final pH of 5.6 This product allows to keep within specification the corrosion rates in white metals such as carbon steel.

Example 4 Into a 1 liter glass vessel provided with cooling jacket and mechanical stirring, 450 g of KT-7800 copolymer were placed and poured into the vessel, then 525 g of the KT-2800 terpolymer are weighed and added to the vessel without suspending the agitation until obtaining a homogeneous product, no change is reported regarding temperatures, the final product obtained has a pH of 9.8 and a light brown color.

Example 5 Into a 1 liter glass vessel provided with cooling jacket and mechanical stirring, 495 g of KT-7800 copolymer were placed and poured into the vessel, then 500 g of the KT-2800 terpolymer is weighed and added to the vessel without suspending the agitation until obtaining a homogeneous product, during its homogenization there were no changes in temperature, the final product obtained has a pH of 9.7 and a light brown color.

The final product obtained through the process described above and based on the relationship that each of its components, keep suspended dissolved solids and the content of calcium and silica salts containing the cooling water of the cooling systems of the Methanol I and Methanol II plants of the Independencia Petrochemical Complex in the State of Puebla.

Claims (2)

NOVELTY OF THE INVENTION Having described the present invention, it is considered as a novelty and therefore the contents of the following clauses are claimed from our property:

1. A semi-organic multifunctional composition for the treatment of water with high silica content and with corrosive tendencies for white metals, in the cooling water in cooling towers, which inhibits corrosion, fouling and fouling constituted by two parts: the first characterized because it contains in its formulation of 5 to 40% by weight of hydroxyphosphonic acid, used as a corrosion inhibitor, of 2 to 30% by weight of monoethanolamine, 10 to 20% of zinc chloride and 10 to 60% by weight of water demineralized (IMP-TE-508.1); the second formulation is characterized in that it contains from 10 to 50% by weight of the organic copolymer KT-7800, from 10 to 50% by weight of the organic terpolymer KT-2800

2. A multifunctional semi-organic composition for the treatment of water with high silica content and with corrosive tendencies for white metals, in the cooling water in cooling towers, according to clause 1, characterized because it allows to increase up to 4 times the concentration of solids in cooling water, or contributing in this way in a significant saving in the requirements of spare water in these equipments n and consequently a decrease in the electric power consumption of the replacement water dosing equipment. A semi-organic multifunctional composition for the treatment of water with a high content of silica and with corrosive tendencies for white metals, in the replacement water in cooling towers according to clauses 1 and 2, characterized in that it presents high efficiency of inhibition to the incrustation even in cooling systems whose recirculation waters contain high concentrations of silica and with corrosive tendencies for white metals such as carbon steel. A multifunctional semi-organic composition for the treatment of water with high silica content and with corrosive tendencies for white metals, in the replacement water in cooling towers, according to clauses 1, 2 and 3, characterized in that it keeps under control the corrosion in pipes , carbon steel from heat exchangers in cooling systems.