Preparation method and application of polyhydrazide with viscosity-lowering, pour-point-lowering and corrosion-inhibiting effects

Abstract

The invention relates to a method for preparing polyhydrazide with effects on lowering viscosity, lowering coagulability and inhibiting corrosion and application thereof. The method comprises the steps of dissolving natural oil and fat into a first organic solvent in a reactor, adding a hydrazine hydrate solution, heating for refluxing, and cooling to room temperature; pouring the first organic solvent out of the reactor, wherein a remaining faint-yellow fat-like substance is long-chain fatty hydrazide; adding a second organic solvent into the reactor while stirring, adding a cross-linking agent and alkali into the reactor, heating reactants in a vessel, cooling to room temperature, and filtering to remove insoluble matters, thereby obtaining a pale-yellow polyhydrazide solution; or evaporating to remove the second organic solvent from the pale-yellow polyhydrazide solution, so as to obtain pale-yellow waxy solids, namely polyhydrazide. The polyhydrazide is used as a crude oil additive and can lower the thermal stability of a comb polymer additive in crude oil and the crystal nucleus distorting effect of polar groups; meanwhile, the polyhydrazide can be adsorbed to the surface of metal through the coordination between nitrogen and oxygen atoms and metal, so as to form an organic protective layer to play a role in inhibiting corrosion.

Description

technical field

[0001] The invention relates to the technical field of polyhydrazides, in particular to a preparation method and application of polyhydrazides with functions of reducing viscosity, pour point and corrosion. Background technique

[0002] Polymers with long alkyl side chains and comb-shaped polymers are an important class of polymers, such as polyacrylic high carbon alcohol ester, polyacrylic acid high carbon amine amide, polymaleic acid high carbon alcohol ester, polymaleic acid high carbon amine Copolymers of amides and their monomers or copolymers with monomers such as styrene and vinyl acetate, etc. This type of polymer can be used as a pour point depressant for high-point crude oil, a viscosity depressant for high-viscosity crude oil, a wax inhibitor for crude oil, a drag reducer for crude oil transportation, and other oilfield chemicals. At present, the main chain of this type of polymer used is a long alkyl chain, which functions as connecting side cha...

Examples

Embodiment 1

[0017] The preparation method of the polyhydrazide with viscosity-decreasing, pour-point-decreasing and corrosion-inhibiting functions comprises the following steps:

[0018] The first step, in the reactor, natural oil is dissolved in the first organic solvent of 80 times of quality, and natural oil is soybean oil and palm oil that mass ratio is 1:2, and described first organic solvent is industrial grade methanol;

[0019] Second step, under stirring, add the hydrazine hydrate solution that is 4: 1 with the molar ratio of natural grease substance in above-mentioned mixture, and described hydrazine hydrate solution is the aqueous solution of industrial grade 40%;

[0020] The third step is to heat and reflux at 65°C for 10 hours under stirring, and cool to room temperature;

[0021] The fourth step is to pour out the first organic solvent in the reaction kettle, and the remaining light yellow fat is long-chain fatty hydrazide;

[0022] Step 5, under stirring, add a second org...

Embodiment 2

[0027] The preparation method of the polyhydrazide with viscosity-decreasing, pour-point-decreasing and corrosion-inhibiting functions comprises the following steps:

[0028] In the first step, the natural oil is dissolved in the first organic solvent of 50 times the mass in the reactor, the natural oil is soybean oil and sheep oil with a mass ratio of 1:1, and the first organic solvent is chemically pure ethanol;

[0029] In the second step, under stirring, adding a hydrazine hydrate solution with a molar ratio of 4: 1 to the above-mentioned mixture, the hydrazine hydrate solution is an aqueous solution of analytically pure 50%;

[0030] The third step is to heat and reflux at 78°C for 8 hours under stirring, and cool to room temperature;

[0031] The fourth step is to pour out the first organic solvent in the reaction kettle, and the remaining light yellow fat is long-chain fatty hydrazide;

[0032] Step 5, under stirring, add a second organic solvent of 8 times the quality...

Embodiment 3

[0037] The preparation method of the polyhydrazide with viscosity-decreasing, pour-point-decreasing and corrosion-inhibiting functions comprises the following steps:

[0038] In the first step, the natural oil is dissolved in the first organic solvent of 40 times the mass in the reactor, the natural oil is lard, and the first organic solvent is chemically pure methanol;

[0039] In the second step, under stirring, adding a hydrazine hydrate solution with a molar ratio of 3.5: 1 to the above mixture into the above-mentioned mixture, the hydrazine hydrate solution is an aqueous solution of analytically pure 50%;

[0040] The third step is to heat and reflux at 65°C for 10 hours under stirring, and cool to room temperature;

[0041] The fourth step is to pour out the first organic solvent in the reaction kettle, and the remaining light yellow fat is long-chain fatty hydrazide;

[0042] Step 5, under stirring, add a second organic solvent with 10 times the mass of natural oil into ...

technical field

[0001] The invention relates to the technical field of polyhydrazides, in particular to a preparation method and application of polyhydrazides with functions of reducing viscosity, pour point and corrosion. Background technique

[0002] Polymers with long alkyl side chains and comb-shaped polymers are an important class of polymers, such as polyacrylic high carbon alcohol ester, polyacrylic acid high carbon amine amide, polymaleic acid high carbon alcohol ester, polymaleic acid high carbon amine Copolymers of amides and their monomers or copolymers with monomers such as styrene and vinyl acetate, etc. This type of polymer can be used as a pour point depressant for high-point crude oil, a viscosity depressant for high-viscosity crude oil, a wax inhibitor for crude oil, a drag reducer for crude oil transportation, and other oilfield chemicals. At present, the main chain of this type of polymer used is a long alkyl chain, which functions as connecting side cha...

Examples

Embodiment 1

[0017] The preparation method of the polyhydrazide with viscosity-decreasing, pour-point-decreasing and corrosion-inhibiting functions comprises the following steps:

[0018] The first step, in the reactor, natural oil is dissolved in the first organic solvent of 80 times of quality, and natural oil is soybean oil and palm oil that mass ratio is 1:2, and described first organic solvent is industrial grade methanol;

[0019] Second step, under stirring, add the hydrazine hydrate solution that is 4: 1 with the molar ratio of natural grease substance in above-mentioned mixture, and described hydrazine hydrate solution is the aqueous solution of industrial grade 40%;

[0020] The third step is to heat and reflux at 65°C for 10 hours under stirring, and cool to room temperature;

[0021] The fourth step is to pour out the first organic solvent in the reaction kettle, and the remaining light yellow fat is long-chain fatty hydrazide;

[0022] Step 5, under stirring, add a second org...

Embodiment 2

[0027] The preparation method of the polyhydrazide with viscosity-decreasing, pour-point-decreasing and corrosion-inhibiting functions comprises the following steps:

[0028] In the first step, the natural oil is dissolved in the first organic solvent of 50 times the mass in the reactor, the natural oil is soybean oil and sheep oil with a mass ratio of 1:1, and the first organic solvent is chemically pure ethanol;

[0029] In the second step, under stirring, adding a hydrazine hydrate solution with a molar ratio of 4: 1 to the above-mentioned mixture, the hydrazine hydrate solution is an aqueous solution of analytically pure 50%;

[0030] The third step is to heat and reflux at 78°C for 8 hours under stirring, and cool to room temperature;

[0031] The fourth step is to pour out the first organic solvent in the reaction kettle, and the remaining light yellow fat is long-chain fatty hydrazide;

[0032] Step 5, under stirring, add a second organic solvent of 8 times the quality...

Embodiment 3

[0037] The preparation method of the polyhydrazide with viscosity-decreasing, pour-point-decreasing and corrosion-inhibiting functions comprises the following steps:

[0038] In the first step, the natural oil is dissolved in the first organic solvent of 40 times the mass in the reactor, the natural oil is lard, and the first organic solvent is chemically pure methanol;

[0039] In the second step, under stirring, adding a hydrazine hydrate solution with a molar ratio of 3.5: 1 to the above mixture into the above-mentioned mixture, the hydrazine hydrate solution is an aqueous solution of analytically pure 50%;

[0040] The third step is to heat and reflux at 65°C for 10 hours under stirring, and cool to room temperature;

[0041] The fourth step is to pour out the first organic solvent in the reaction kettle, and the remaining light yellow fat is long-chain fatty hydrazide;

[0042] Step 5, under stirring, add a second organic solvent with 10 times the mass of natural oil into ...