Rigorous peer-reviews are the basis of high-quality academic publishing. Thanks to the great efforts of our reviewers, Separations was able to maintain its standards for the high quality of its published papers. Thanks to the contribution of our reviewers, in 2021, the median time to first decision was 14 days and the median time to publication was 36 days. The editors would like to extend their gratitude and recognition to the following reviewers for their precious time and dedication, regardless of whether the papers they reviewed were finally published:
| A. S. M. Monjur Al Hossain | Jose Antonio Moler |
| Abhigya Mookherjee | José Cheel |
| Abhijit Ghosh | José Luis Guil-Guerrero |
| Adam Sajnóg | José Luis Izquierdo-García |
| Adam T. Sutton | José Pinela |
| Adela R. Mauri-Aucejo | Josias Merib |
| Adina Ionuta Gavrila | Jozsef Simon |
| Adriana Trifan | Juan B. Arellano |
| Agata Dąbrowska | Juan M. Padro |
| Agata Swiatly-Blaszkiewicz | Jun Dang |
| Agnese Aguzzoni | Jung-Lee Lin |
| Agnieszka Kicel | Junyi Liu |
| Agnieszka Urbanowska | Jürgen Martens |
| Ahmad Rohanifar | Justyna Płotka-Wasylka |
| Ahmad Rois Mansur | Karen Methling |
| Akira Otsuki | Karolina A. Wojtunik-Kulesza |
| Ala Altaie | Karthik Tappa |
| Alberto Barbiroli | Karthikraj Rajendiran |
| Alberto Sánchez Guijo | Katalin Lányi |
| Alejandro Hernández-León | Katarína Maráková |
| Aleš Obreza | Katarzyna Bober-Majnusz |
| Alessandra Biancolillo | Katarzyna Kosicka-Noworzyń |
| Alessandra De Bruno | Katarzyna Majchrzycka |
| Alex Boye | Katarzyna Marciniak-Lukasiak |
| Alexa Ersilia | Kavita Sharma |
| Alexander Nikolaev | Kazuya Murata |
| Alexandra Fidalgo | Kecheng Guan |
| Ali Azizi | Keenan J. Mintz |
| Alicja Wzorek | Keiji Jindo |
| Alina Diuzheva | Keisuke Ohto |
| Alina Plenis | Keshav Kumar |
| Ambal Jayaraman | Keun-Yeong Jeong |
| Amin Mousavi Khaneghah | Ki Soo Park |
| Amir Mosavi | Kihwan Choi |
| Amit Jaiswal | Kira V. Vyatkina |
| Ana Filipa Pires | Kishneth Palaniveloo |
| Ana Jurinjak Tusek | Koichiro Shiomori |
| Ana Leahu | Konstantinos Kasiotis |
| Ana V. González-De-Peredo | Konstantinos Kouremenos |
| Ancuţa Elena Tiuc | Krisztina Nikovics |
| Andrea Giacometti | Krzysztof Gorynski |
| Andrea Hulina-Tomašković | Kulyash Meiramkulova |
| Andrea Salvo | Kurunthachalam Kannan |
| Andrea Spallarossa | Lara Lohmann |
| Andrea Zaffora | László Hazai |
| Andrea Zerboni | Laurent Dupont |
| Andreea L. Chibac-Scutaru | Leao Martins José Manuel |
| Andreea Ratiu | Lecturer Carmen Rodica Pop |
| Andrei Utkin | Lena Ruzik |
| Andrey Voshkin | Lianbo Li |
| Aneta Sawikowska | Lina Cossignani |
| Angela Santilio | Lisa Pilkington |
| Angelo Fontana | Lubov Snegur |
| Ankana Kakoti | Luc Negroni |
| Anna Drabik | Luca Narduzzi |
| Anna Merecz-Sadowska | Lucia Baldino |
| Anna Petruczynik | Lucia Mainero Rocca |
| Anna Wołowicz | Lucie Plíhalová |
| Anna Worthmann | Lucrezia Sergio |
| Ante Prkić | Luigi De Masi |
| Antía González Pereira | Luna Maslov Bandić |
| Antonella Rosa | Maciej Jarzebski |
| Antonio Biondi | Maciej Tankiewicz |
| Antonio Tagarelli | Magdalena Bartnik |
| Antonio Turco | Magdalena Jeszka-Skowron |
| Antonio V. Herrera-Herrera | Magdalena Szeliga |
| Antonio Zuorro | Magdalena Wrona |
| Antony Kam | Małgorzata Janicka |
| Apostolia Tsiasioti | Małgorzata Olejnik |
| Aránzazu Mendía | Małgorzata Szultka-Młyńska |
| Arkadiusz Matwijczuk | Małgorzata Wroniak |
| Armando Alexei Rodríguez | Manohar Prasad Bhandari |
| Arnaud Bertsch | Mansour Sobeh |
| Artem Rogachev | Manuel Caravaca Garratón |
| Arun Jayaseelan | Manuela Stefanelli |
| Ashis Mondal | Marc Koyack |
| Augustin C Mot | Marco Contardi |
| Augustin Mot | Marco Giampà |
| Awais Ahmad | Marek Majdan |
| Balaji Nagarajan | Marek Tańczyk |
| Balawanthrao Jadhav | Marek Tobiszewski |
| Barbara Bojko | Maria Alzira Pimenta Dinis |
| Bartosz Kruszewski | María Del Mar Ramírez Fernández |
| Beata Hukowska-Szematowicz | Maria Gonnella |
| Beata Polák | Maria João Regufe |
| Bin Ding | Maria Leżańska |
| Bin Wang | Maria Pia Sammartino |
| Bogdan Gabriel Șlencu | Maria-Cristina Todasca |
| Branimir Pavlić | Marián Masár |
| Brienne N. Seiner | Mariana Buranelo Egea |
| Bulat R. Saifutdinov | Marija Banožić |
| Bulat Ramazanov | Marija Jozanović |
| Camilla Montesano | Marijana Popović |
| Catia Martins | Mariusz Fleszar |
| César Oliveira | Mariusz Mojzych |
| Chadin Kulsing | Mark Berhow |
| Chandra Risdian | Markel Vinogradov |
| Chandrashekhar Honrao | Marta De Diego |
| Chang Won Choi | Marta Ferreiro-González |
| Chao Kang | Martin Seipenbusch |
| Charalampos Proestos | Martina Catani |
| Chenxiao Jiang | Martyna Rzelewska-Piekut |
| Chia-Hsien Feng | Masamitsu Maekawa |
| Chihyang Wang | Mauricio Alcolea Palafox |
| Chi-Rei Wu | Md Tabish Noori |
| Chris Douvris | Mehdi Safari |
| Christiana Mantzourani | Melinda Fogarasi |
| Christopher Ehrhardt | Michael Hughes |
| Constantinos K. Zacharis | Michail Syrpas |
| Cosima Damiana Calvano | Michal Kohout |
| Cristina Caleja | Mihaela Niculae |
| Cristina Soares | Mihaly Dernovics |
| Csilla Kallay | Mihkel Koel |
| Daipayan Roy | Miklós Nagy |
| Dalibor Šatínský | Mingchih Fang |
| Dan Bahadur Pal | Mira Pucarević |
| Dani Dordevic | Mohamed Al-Fatimi |
| Daniel Bilbao | Mohamed El Raey |
| Daniel Cozzolino | Mohammad Javed Ansari |
| Daniel Kam-Wah Mok | Mohammed Hasan |
| Daniel Peterson | Mojca Čakić Semenčić |
| Danila Limauro | Monica Gallo |
| David Gamliel | Monica Tarcea |
| David Jaime Cocovi Solberg | Monika Sobiech |
| David Obeso | Muhammad Ans |
| David Šilha | Muharfiza Muharfiza |
| David Sykora | Muhhamad Sajid |
| Deepchandra Srivastava | Mukesh Upadhyay |
| Denis Bémer | Narcis Bârsan |
| Denis Pankratov | Natalia Campillo |
| Diana Costinel | Natalia Drabińska |
| Dimitrina Zheleva-Dimitrova | Natalia Jatkowska |
| Dmitry S. Kosyakov | Natalia Manousi |
| Doina Humelnicu | Natalia Menshutina |
| Dominico A Guillén-Sánchez | Nicholas H. Snow |
| Edenilson Dos Santos Niculau | Nicolas Reynier |
| Edgar Pinto | Nicoleta Radu |
| Edyta Łaskawiec | Nicolò Riboni |
| Elijah Petersen | Niels Geudens |
| Elisabetta Torregiani | Nikolaos Koukouzas |
| Enos C. Inniss | Nilesh Choudhary |
| Eric Deslandes | Nirakar Pradhan |
| Ernesto Reverchon | Nobutoshi Ota |
| Evan Pannkuk | Noureddine Lebaz |
| Evgenios Kokkinos | Nozomu Suzuki |
| Ewa Knapik | Nunzia Iaccarino |
| Ewelina Dziurkowska | Oleg Alexandrov |
| Fadia Salah Youssef | Olga Orynycz |
| Fatima Bento | Ondrej Kurka |
| Fei Guo | Pablo Miralles |
| Fernando Andrade | Paola Montoro |
| Florentina-Daniela Munteanu | Paraskev Todorov Nedialkov |
| Francesca Melini | Paraskevas D. Tzanavaras |
| Francesco Cimino | Patricia Regal |
| Francesco De Mastro | Patrick Dansette |
| Francisca Rodrigues | Paulmanickam Koilraj |
| François Couderc | Pavel Serov |
| Frangipane Maria Teresa | Pawel Pohl |
| Franks Kamgang Nzekoue | Paweł Siudem |
| Frantisek Hrdlicka | Paweł Świt |
| Fred Luzzio | Pedro Silva |
| Fu Wa Lee | Peršurić Anita Silvana Ilak |
| Fumiko Kihara-Negishi | Peta Harvey |
| Gabriel Hancu | Pete Wilde |
| Gabriela Chavez-Calvillo | Peter Mikuš |
| Gabriela Cristea | Petr Česla |
| Gabriela Ventura | Petr Kozlík |
| Gabrieli Bernardi | Philippe Urban |
| Gabriella Tamasi | Pilar Campíns-Falcó |
| Gene Gillman | Piotr Luliński |
| Georgiana Codina | Piotr Okińczyc |
| Georgios Diamantopoulos | Preeti Chandra |
| Gerard Dumancas | Priyesh Wagh |
| Gheorghe Nechifor | Prodromos Skenderidis |
| Giacomo Luci | Przemysław Dorożyński |
| Giacomo Musile | Przemysław Kosobucki |
| Gianni Pastore | Rafał Frański |
| Giorgio Facchetti | Rafał Wawrzyniak |
| Giulia Mazzoccanti | Raffaele Ricco |
| Giuseppe Mannino | Rajmund Michalski |
| Giuseppe Storti | Randal S. Stahl |
| Giuseppina Di Lorenzo | Rasangi Wimalasinghe |
| Gobinath Ravindran | Richard Broughton |
| Grażyna Kowalska | Ri-Yuan Tang |
| Guan-Jhong Huang | Robert Rusinek |
| Guillaume L. Erny | Roberta Moschini |
| Gyöngyi Gyémánt | Roberto Ciccoritti |
| György Keglevich | Roberto Romero-González |
| Gyorgy Szekely | Rodica-Mihaela Dinica |
| Haining Liu | Rodrigo Heyder |
| Haishu Lin | Roman Dema |
| Hanne Diliën | Roman Turczyn |
| Hanno Erythropel | Rosa Herráez-Hernández |
| Hao-ai Shui | Rosa Perestrelo |
| Haoyu Tang | Roumiana Stateva |
| Hari Prasad Devkota | Ruchika Bhawal |
| Haruhisa Kikuchi | Ruth Young |
| Hassan El-ramady | Ryan A. Henry |
| Hefei Zhao | Ryszard Blazejewski |
| Hélène Roux De Balmann | Sabine Harrison |
| Helinando Pequeno De Oliveira | Salvador E. Maestre Pérez |
| Henry Chun Hin Law | Salvatore Barreca |
| Hesham R. Hesham R. El-Seedi | Salvatore Fanali |
| Hong-Duck Kim | Sami Eldeeb |
| Hugo M. Oliveira | Sanda Andrei |
| Hung-Yin Lin | Sandra Cruz |
| Hunter Moseley | Sano Yoshihiko |
| Ian Foulds | Sara S. Reis |
| Ibrahim Al-Ashkar | Sarbjit Singh |
| Idaira Pacheco-Fernández | Satoshi Ogata |
| Igor G. Zenkevich | Saurin Patel |
| Ilona Olędzka | Serena Bandini |
| Ioan Calinescu | Sherif El-Sayed Okeil |
| Irene Panderi | Sherif T.S. Hassan |
| Ireneusz Sowa | Shigeru Katayama |
| Irina Ielciu | Shingo Kimuro |
| Isabel Andrade | Shrikant Sharma |
| Ivan De Paola | Simon Cameron |
| Ivan M. Savic | Simona Felletti |
| Ivan V. Nechepurenko | Simonetta Capone |
| Ivana Tomaz | Slaven Jurić |
| Ivayla Dincheva | Soleya Dagnon |
| Ivelina K. Shishkova | Song Zhen |
| Iwona Grabowska | SreeHarsha Nagaraja |
| Iwona Morkunas | Srinath Pashikanti |
| Jaime Carbajo | Stanislav N Naryzhny |
| Jan Petr | Stefano Crespi |
| Jan Szadkowski | Stefanos Leontopoulos |
| Jasna Jablan | Su-il In |
| Javier Peña | Sungyong Mun |
| Jayson V. Pagaduan | Svetlana Vujić |
| Jean-Denis Bailly | Sylwia Studzinska |
| Jelena Gorbatsova | Szymon Bocian |
| Jérôme Guitton | Tomohiko Isobe |
| Jerzy Juśkiewicz | Tomoyuki Iwata |
| Jerzy Żuchowski | Toshihiko Hanai |
| Jia-Lin Wang | Valeriy Snakin |
| Jingshu Guo | Wojciech Grochocki |
| Joana S. Amaral | Yang Li |
| Joanna Dagmara Fedorowicz | Yongchang Cao |
| Joanna Gdula-Argasińska | Yuan-Shuai Liu |
| Joerg Reinders | Yuelong Chen |
| Jolanta Flieger | Zhifeng Du |
| Jong Hwa Lee | Zhipeng Li |
| Jorge M Alves-Silva | Zsuzsanna Balogh-Brunstad |
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