A literature survey is not a collection of paraphrases from many sources instead it is a serious evaluation of previous researches with an aim to expand on the reasons for pursuing a particular research. See the post critical reading in literature survey.
The literature survey is best written if it is designed to contain the at least the following information; history and background, problem statement, methodology and objectives.
History and background: It reviews previous literature on related topics of the main research idea. Note that you should write only relevant information. Don´t fall in the trap of stating every trivial but non important texts just because you like them or want to increase your thesis volume.
For a plant design project, the best contents are short description of the process, chemical
