A method of producing carbon fibers by forming, via a one pot acidic precipitation, a precipitated lignin from a precipitation solution by contacting a lignin solution and an acid solution, wherein the precipitation solution comprises the lignin solution and the acid solution, wherein the lignin solution comprises lignin dissolved in a basic aqueous solution, and wherein the acidic solution has a pH of less than or equal to about 6, 5, 4, 3, or 2; forming precursor fibers from the precipitated lignin; and subjecting the precursor fibers to thermostabilization, carbonization, or both to produce the carbon fibers.

The present application is directed to a method of producing a lignin-based carbon fiber. This method comprises providing a lignin-containing material; producing a lignin fiber from the lignin-containing material; stabilizing the lignin fiber under tension, where the tension is adjusted during said stabilizing such that the maximum bearable tension is applied to the lignin fiber; and carbonizing the lignin fiber under tension to produce a carbon fiber, where said carbonizing is carried out at a temperature below 1200? C. and where the tension during said carbonizing is adjusted to avoid shrinkage. The present application is also directed to a lignin-based carbon fiber and molded articles containing such fibers.

The present application is directed to a method of producing a lignin-based carbon fiber. This method comprises providing a lignin-containing material; producing a lignin fiber from the lignin-containing material; stabilizing the lignin fiber under tension, where the tension is adjusted during said stabilizing such that the maximum bearable tension is applied to the lignin fiber; and carbonizing the lignin fiber under tension to produce a carbon fiber, where said carbonizing is carried out at a temperature below 1200? C. and where the tension during said carbonizing is adjusted to avoid shrinkage. The present application is also directed to a lignin-based carbon fiber and molded articles containing such fibers.

A cooking method and a digester system wherein partly digested cellulosic fiber source is compressed during cooking to provide high molecular weight lignin and pulp.

A process for producing a highly carbonaceous fibre or set of fibres including combining a structured precursor comprising a hydrocellulose fibre or a set of fibres, and an unstructured precursor, including lignin or a lignin derivative in the form of a solution having a viscosity less than 15,000 mPa.Math.s.sup.1 at the temperature at which the combination step takes place, in order to obtain a hydrocellulose fibre or set of fibres coated with the lignin or lignin derivative, wherein the process further includes a step of thermal and dimensional stabilization of the hydrocellulose fibre or set of fibres covered with the lignin in order to obtain a hydrocellulose fibre or set of fibres covered with a deposit of lignin or lignin derivative, and a carbonization step of the hydrocellulose fibre or set of fibres coated with a lignin deposit in order to obtain a highly carbonaceous fibre or set of fibres.

A process for producing a highly carbonaceous fibre or set of fibres including combining a structured precursor comprising a hydrocellulose fibre or a set of fibres, and an unstructured precursor, including lignin or a lignin derivative in the form of a solution having a viscosity less than 15,000 mPa.Math.s.sup.1 at the temperature at which the combination step takes place, in order to obtain a hydrocellulose fibre or set of fibres coated with the lignin or lignin derivative, wherein the process further includes a step of thermal and dimensional stabilization of the hydrocellulose fibre or set of fibres covered with the lignin in order to obtain a hydrocellulose fibre or set of fibres covered with a deposit of lignin or lignin derivative, and a carbonization step of the hydrocellulose fibre or set of fibres coated with a lignin deposit in order to obtain a highly carbonaceous fibre or set of fibres.

A process for the production of highly carbonaceous material, including combining a structured precursor including fibres and an unstructured precursor, in the form of a fluid, wherein the fluid has a viscosity of less than 45,000 mPa.Math.s.sup.1 at the temperature at which the combination step occurs, and including at least a cyclic organic or aromatic compound in the molten state, or in solution at a concentration by weight of less than or equal to 65%, in order to obtain a combined precursor corresponding to the structured precursor covered by the unstructured precursor, wherein the process further includes step of thermal and dimensional stabilization of the combined precursor in order to obtain fibres covered with a cyclic organic or aromatic compound deposit, and a step of carbonization of the fibres covered with a cyclic organic or aromatic compound deposit in order to obtain a highly carbonaceous material.

A process for the production of highly carbonaceous material, including combining a structured precursor including fibres and an unstructured precursor, in the form of a fluid, wherein the fluid has a viscosity of less than 45,000 mPa.Math.s.sup.1 at the temperature at which the combination step occurs, and including at least a cyclic organic or aromatic compound in the molten state, or in solution at a concentration by weight of less than or equal to 65%, in order to obtain a combined precursor corresponding to the structured precursor covered by the unstructured precursor, wherein the process further includes step of thermal and dimensional stabilization of the combined precursor in order to obtain fibres covered with a cyclic organic or aromatic compound deposit, and a step of carbonization of the fibres covered with a cyclic organic or aromatic compound deposit in order to obtain a highly carbonaceous material.

The invention relates to a process for producing at least one alkoxylated polyphenol comprising the following successive steps: (a) reacting at least one polyphenol, at least one alkoxylating agent, at least one catalyst, in the presence of at least one alkoxylated polyphenol as a solvent, the polyphenol/polyphenol alkoxylated weight ratio as a solvent being less than 2, preferably less than or equal to 1.5, more preferably less than or equal to 1, even more preferably less than or equal to 0.5; (b) removing the residual alkoxylating agent;

The invention relates to a process for producing at least one alkoxylated polyphenol comprising the following successive steps: (a) reacting at least one polyphenol, at least one alkoxylating agent, at least one catalyst, in the presence of at least one alkoxylated polyphenol as a solvent, the polyphenol/polyphenol alkoxylated weight ratio as a solvent being less than 2, preferably less than or equal to 1.5, more preferably less than or equal to 1, even more preferably less than or equal to 0.5; (b) removing the residual alkoxylating agent;