Method for preparing a gelling and viscosifying agent for drilling mud and the product thereof
AssigneeUniversiti Sains Malaysia
InventorsMohamad Nasir Bin Mohamad Ibrahim, Mohamed Rashid Ahmed Mohamed Haras, Coswald Stephen Sipaut
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Abstract
A method for preparing lignin graft copolymer comprising: reacting lignocellulosic materials with an acrylic compound by bulk condensation under nitrogen atmosphere in the presence of a non-oxidizing strong organic acid as catalyst; separating the reaction mixture to obtain a solid phase mainly containing lignocellulosic materials and a liquid phase containing lignin graft copolymer and unreacted acrylic compound; and removing solvent from the liquid phase to obtain the lignin graft copolymer.
Claims13
A method for preparing lignin graft copolymer, comprising:
- reacting lignocellulosic materials with an acrylic compound by bulk condensation polymerization under a nitrogen atmosphere in the presence of a non-oxidizing strong organic acid as a catalyst to form a reaction mixture;
- separating the reaction mixture to obtain a solid phase containing lignocellulosic materials and a liquid phase containing lignin graft copolymer and unreacted acrylic compound, wherein the liquid phase contains a solvent;
- and
- removing at least a portion of the solvent from the liquid phase to obtain the lignin graft copolymer.
A method for preparing lignin graft copolymer, comprising:
- reacting lignocellulosic materials with an acrylic compound by bulk condensation polymerization under a nitrogen atmosphere in the presence of a non-oxidizing strong organic acid as a catalyst to form a reaction mixture;
- wherein the reaction is terminated by exposing the reaction mixture to air and cooling the reaction mixture;
- separating the reaction mixture to obtain a solid phase containing lignocellulosic materials and a liquid phase containing lignin graft copolymer and unreacted acrylic compound, wherein the liquid phase contains a solvent;
- and
- removing at least a portion of the solvent from the liquid phase to obtain the lignin graft copolymer.
A method for preparing lignin graft copolymer, comprising:
- reacting lignocellulosic materials with an acrylic compound by bulk condensation polymerization under a nitrogen atmosphere in the presence of a non-oxidizing strong organic acid as a catalyst to form a reaction mixture;
- separating the reaction mixture to obtain a solid phase containing lignocellulosic materials and a liquid phase containing lignin graft copolymer and unreacted acrylic compound, wherein the reaction mixture is separated by a zinc sulfate solution, wherein the liquid phase contains a solvent;
- and
- removing at least a portion of the solvent from the liquid phase to obtain the lignin graft copolymer.
Dependencies are inferred from the claim text.