Petroleo Brasileiro S.a. - Petrobras

Uniao Brasileira De Educacao E Assistencia-mantenedora Da Pucrs

Universidade Federal Do Rio Grande Do Sul-ufrgs

Sonia Maria Cabral De Menezes

Jailton Ferreira Do Nascimento

Dellyo Ricardo Dos Santos Alvares

Renan Bordulis Martel

Ana Paula Santana Musse

Victor Hugo Jacks Mendes Dos Santos

Felipe Dalla Vecchia

Jose Antonio Vidal Vieira

Jairton Dupont

Sandra Mara De Oliveira Einloft

Darlan Pontin

Gabriela Gonçalves Dias Ponzi

Marta Kerber Schütz

Alessandra Rangel Cassella

Michele Sabba Da Silva Lima

Bruna Santiago Dias

Amanda Sofia De Guimarães E Stepanha

Bernardo Dias Ribeiro

Luiz Silvino Chinelatto Junior

Amanda Sofia De Guimaräes E Stepanha

Carla De Araujo Ferreira

Graciane Marin

Francisco Paulo Dos Santos

Günter Ebeling

Guilherme De Lemos Pinto Aydos

The present invention describes a hydraulic cement composition, process and use thereof, wherein the composition comprises a hydraulic cement composition with increased resistance against carbon dioxide (CO) for application in reservoirs such as oil and gas and carbon capture and storage (CCS) wells; with improved performance of cement paste formulations as a material for application in primary, secondary cementing, recovery and/or plugging operations, of reservoirs/wells that operate with high COcontent; as a technological alternative to guarantee the integrity of wells in CO-rich environments for long periods of time, without any additional intervention to the already current operational procedures for cementing wells, and with cost reduction in relation to class G cement (currently, the main raw material); and sufficient chemical resistance to carry out enhanced oil (EOR) and gas (EGR) recovery by injecting high levels of CO, increasing reservoir pressure throughout the extraction period of hydrocarbon reservoirs.

Hydraulic cement composition, process and use

The present invention describes a process for pretreatment of lignocellulosic biomass that comprises the step of contacting a lignocellulosic biomass with an ionic liquid consisting of a phthalic salt of dicholine in the weight ratio from 1:1 to 1:100 of biomass:ionic liquid, said step taking place for a period of time that varies from 0.4 to 48 hours and in a temperature range that varies from 60 to 200&#xb0; C. Furthermore, the present invention also relates to the use of the pretreated lignocellulosic biomass in an enzymatic hydrolysis process.

Method for pretreating lignocellulosic biomass

A process for producing biodiesel from natural oils and/or fats, a low molecular weight C-Calcohol and catalyst is described. The process preferably uses vegetable oils and is specifically configured for producing biodiesel from castor oil.

Process for producing biodiesel

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