Kemira Oyj

Andritz Oy

Aalto University Foundation

Nordic Bioproducts Group Oy

Aalto University Foundation Sr

Kari Vanhatalo

Olli Dahl

Kari Parviainen

Veli-Matti Vuorenpalo

Marcus Lillandt

Asko Karppi

Hannu Råmark

Leif Robertsen

Matti Hietaniemi

Kari Peltonen

Kyösti Valta

Tom Lundin

Mikael Svedman

Jukka Kantola

Heikki Hannukainen

Asko Koskimäki

Taina Lintunen

Leif Robertsén

Erkki Iikka Sakari Rasanen

Erkki Iikka Rasanen

Asko Koskimaki

Elina Pesonen

Jukka-Pekka Pelkonen

Erkki Iikka Sakari RÄSÄNEN

A process for producing microcrystalline cellulose from fibrous cellulosic material by acid hydrolysis at an MCC plant. In this process a suspension of cellulosic pulp is thickened, so that filtrate is formed. A consistency of the thickened suspension is adjusted to 5-40% by adding dilution liquid, and the pH of the suspension is adjusted to a value of 4 or less with acid. The pulp suspension is subjected to acid hydrolysis of at least 120° C. in a reactor to produce a mixture of microcrystalline cellulose and hydrolysate. The mixture is discharged from the reactor to a lower pressure and lower temperature to flash the mixture and generate flash steam. Microcrystalline cellulose is separated from hydrolysate. The separated cellulose is washed in one or several washing apparatuses. The consistency of the microcrystalline cellulose is increased by thickening and/or drying for further processing.

Process for producing microcrystalline cellulose

According to an example aspect of the present invention, there is provided an animal feed additive, which contains lignin-containing microcellulose, especially lignin-containing microcrystalline cellulose, for improving feed conversion rates of production animals, such as poultry.

Lignin containing microcellulose as an animal feed additive

A method for controlling discharges of nitrogen compounds in the production of cellulose carbamate (CCA). Microcrystalline cellulose is produced from chemical pulp produced at a pulp mill, such that the chemical pulp is subjected to acid hydrolysis at an elevated temperature to form microcrystalline cellulose (MCC) and hydrolysate, and the MCC is reacted with urea to produce cellulose carbamate whereby ammonia is released. The microcrystalline cellulose production and the cellulose carbamate production are integrated into the pulp mill having a flue gas system such that carbon dioxide from the flue gases is reacted with released ammonia to produce urea, which is used in the carbamate production.

Method for producing cellulose carbamate

The present invention relates to a method of producing microfibrillated cellu-lose (MFC) comprising (i) providing cellulosic material, (ii) drying the cellulosic material so that specific surface area (SSA), when measured with BET-method, is at most 10 m/g, and (iii) subjecting the dried cellulosic material to mechanical treatment. The present invention additionally relates to microfibril-lated cellulose produced with the method of the present invention.

Process for producing microfibrillated cellulose and a product thereof

The present invention relates to a process for producing microcellulose comprising subjecting fibrous cellulosic material to acid hydrolysis at a temperature from 10&#xb0; C. to less than 140&#xb0; C. and at a consistency of at least 8% on dry weight of the cellulose, wherein the amount of added acid is from 0.2 to 2%, preferably from 0.3 to 1.9%, more preferably from 0.5 to 1.5% on dry weight of the cellulose.

Process for producing microcellulose

The invention relates to a method for producing microfibrillated cellulose, where a suspension comprising cellulose derivative in a liquid phase which comprises an organic solvent is provided. The suspension of cellulose derivative is mechanically treated and microfibrillated cellulose is obtained. At least a part of the liquid phase from the microfibrillated cellulose is separated and microfibrillated cellulose with a dry solids content of &#x3e;30 weight-% is obtained.

Method for producing microfibrillated cellulose and microfibrillated cellulose

The invention relates to a strength agent for paper, board or the like. The strength agent comprises a first component, which is refined cellulosic fibers having a refining level of &#x3e;70&#xb0; SR, and a second component, which is a synthetic cationic polymer having a charge density of 0.1-2.5 meq/g, determined at pH 2.7, and an average molecular weight of &#x3e;300 000 g/mol. The invention relates also to a use of the strength agent and to a method for increasing strength properties of paper, board or the like.

Strength agent, its use and method for increasing strength properties of paper

The present invention relates to a process for producing microcellulose comprising a) acidifying fibrous cellulosic material, b) washing the acidified cellulosic material, c) optionally dewatering the washed cellulosic material, and d) hydrolyzing the washed or washed and dewatered cellulosic material under acidic conditions at a temperature of at least 120&#xb0; C. and at a consistency of at least 8% on dry weight of the cellulose.

Manufacturing of microcellulose

The present invention relates to a process for producing microcellulose comprising hydrolyzing fibrous cellulosic material with an acid at an elevated temperature or acidifying fibrous cellulosic material followed by washing and hydrolyzing the washed cellulosic material at an elevated temperature to produce a microcellulose-hydrolysate mixture followed by separation of the microcellulose from the hydrolysate, wherein the mixture or separated hydrolysate or microcellulose is optionally neutralized, and wherein the microcellulose production is integrated to production of a pulp mill such that at least part of chemicals used in the acidification, acid hydrolysis and/or neutralization is produced by an integrated chemical recovery process of the pulp mill.

Method to product microcellulose

The present invention relates to a process for producing microcellulose comprising subjecting fibrous cellulosic material to acid hydrolysis at a temperature of at least 40&#xb0; C. and at a consistency of at least 8% on dry weight of the cellulose, wherein the amount of added acid is from 0.2 to 2%, preferably from 0.5 to 1.5% on dry weight of the cellulose.

Growing community of inventors

Helsinki, Finland

Kari Vanhatalo